Who went along with the scout partway?

Balin accompanied Bilbo partway.

".....but anyway I think I will go and have a peep at once and get it over. Now who is coming with me?"

He did not expect a chorus of volunteers, so he was not disappointed. Fili and Kili looked uncomfortable and stood on One leg, but the others made no pretence of offering - except old Balin. the look-out man, who was rather fond the hobbit."