Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
fourth [ˈfɔːθ] adj четвёртый
n (AUT) (also: fourth gear) четвёртая ско́рость f see also fifth
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: