Where does “sfertuț” come from?

sfertuț (Romanian) comes from Romanian șfert, from Ukrainian чверть, from Proto-Slavic četvьrtь, from Proto-Slavic četvьrtъ, from Proto-Balto-Slavic ketwirtas, from Proto-Indo-European *kʷetwr̥tós — fourth.

Ancestry of “sfertuț”, step by step

StepLanguageWordMeaning
1Romanianșfertquarter, fourth
2Ukrainianчвертьquarter, fourth one of four equal parts
3Proto-Slavicčetvьrtь—
4Proto-Slavicčetvьrtъfourth
5Proto-Balto-Slavicketwirtasfourth
6Proto-Indo-European*kʷetwr̥tósfourth
Every word from Proto-Indo-European *kʷetwr̥tós →Every word from Proto-Balto-Slavic ketwirtas →Every word from Proto-Slavic četvьrtъ →