Voted Best Answer
Jul 18, 2019 - 05:39 AM
The rule always applies to numbers from 1 to 19, even when they're used along with higher numbers, which means that fifth will always be "fünfte", whether I'm talking about the fifth, the hundred and fifth or the two thousand and fifth item...
Twelfth = Zwölfte
Seven hundred and twelfth = Siebenhundertzwölfte
Ten thousand and twelfth = Dreitausendzwölfte
I hope this helps,