Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latgalian
catūrts
←
Proto-Balto-Slavic
*ketwirtas
(inherited)
←
Proto-Indo-European
*kʷ(e)twr̥tós
(inherited)
←
Lithuanian
ketvirtas
(cognate)
←
Latvian
ceturtais
(cognate)