Hi! =)))
The reasons why both Ress and Yevgeny failed to write the numbers using letters in Russian are different, but the outcome is one and the same, you ended up with just blunt numbers, not with their verbal equivalents.
For Ress Russian is not quite a native language, that’s why he both failed to understand what you meant by asking to “write the numbers in this paragraph, as I can’t clearly hear the endings…” The reason is, he, just as an absolute majority of the former soviet republics inhabitants, just does NOT know how to correctly change the numerals in various declentions; but the reason is, he doesn’t have to, as he is a system administrator, not a linguist! =))) The correct answer is a fairly logical declention form of an ordinal numeral,
it goes like, “… из золота семьсот шестидесятой пробы…”, or if it were the ordinal 762, it’d be “…семьсот шестьдесят второй пробы”; notice how only the last element of a complex ordinal numeral undergoes declention change, the initial form being “… семьсот шестьдесят два”.
Notice, however, this declention paradigm holds true ONLY for the ORDINAL numerals ! =)))) With CARDINAL numerals it works in a different way, e.g., if we need to say, “… He is happy with 762 golden items” we’ll end up with a rather comlicated declention paradigm, namely, “Он доволен семьюстами шестьюдесятью двумя золотыми изделиями”, the initial form in the nominative case being “семьсот шестьдесят два”…
The reason why Yevgeny, a professional school teacher of the Russian language failed to provide you with the requested form of the numerals is different, but it still has a basis for being justified, in that strangely enough but the declention of complex numerals in Russian is stunningly complicated, to the point that I’d even put off their acquisition process for a much more advanced stage of learning the language, definitely not for the beginner’s stage! For Yevgeny, it’s much more important that you start speaking, even with some mistakes, as it does NOT affect being understood THAT much! =))) That’s why Yevgeny says endings are dropped by the natives; well, they are NOT, but at the beginner’s stage they don’t matter THAT much! =))
For you to write grammatically corectly in Russian, you WILL surely need to know all these endings, but in a casual everyday speech nobody would ever find fault with you, being a foreigner, to use the declention endings incorrectly! =)))
Hopefully, it helps, at least a bit, as I’d like to re-iterate, the numerals declention is one of the most complicated issues even for the native Russian speakers as you have already seen here!