Homework Help: Moment in 3d statics

hi all, i'm new to this forum and have read through alot of the topics. i also tried searching the previous problems, but haven't found anything yet.

anyways, here's my question:

how do i find the reaction (normal) forces on points C, B, and A? i'm trying to do this with the vector method which i originally thought is supposed to be
rac X C + rab X B - rad X F.

the answer is supposed to be Nb=Na=.367F and Nc=.265 and which is what i got doing it the long and painful way of summing all forces and finding moments in 2d first.

thanks.