Oscan pru "for," Umbrian prú- 'id.'
Old Irish ro, forms the perfective
Gothic fra-, forms the perfective
Old Church Slavonic pro- "through," Russian pro- 'id.,' Czech pro- 'id.,' Bulgarian pro- 'id.,' Lithuanian pra- 'id.'
Ancient Greek πρό (pró) "before"
Sanskrit prá "before," Avestan fra- 'id.'