Ill assume that to be the case.
let number of oranges in a bag = x oranges.
Then each box  has x + 34 oranges.
Total number of oranges in the 4 boxes  = 4(x+34)
Total number of oranges in all the bags =  42x
so w e have the equation:-
  42x  = 7/9 * 4(x + 34)
42x =  28/9 ( x + 34)
9*42x = 28(x + 34)
378x = 28x +  952
350x = 952
x =  2.72
I think you might have the values in the question wrong  because this figure should be a whole number