Where does “чацвёрты” come from?
чацвёрты (Belarusian) comes from Old East Slavic четвьртъ, from Proto-Slavic četvьrtъ, from Proto-Balto-Slavic ketwirtas, from Proto-Indo-European *kʷetwr̥tós.
чацвёрты (Belarusian): fourth
Ancestry of “чацвёрты”, step by step