A + B + C = 312, given that a, B and C can be divisible by 789 respectively and the quotient is the same, what are ABC equal to

A + B + C = 312, given that a, B and C can be divisible by 789 respectively and the quotient is the same, what are ABC equal to

a/7=b/8=c/9
And then we launched the,
a=7/8b
c=9/8b
be
3b=312
b=104
At this point:
a=91
c=117