Let the amount of cranberry juice used for making fruit punch = x
Since, the recipe requires twice as much orange juice as cranberry juice.
So, the amount of orange juice used for making fruit punch =

Since, the recipe requires 8 times as much ginger ale as cranberry juice.
So, the amount of ginger ale used for making fruit punch =

Since, he plans to make 176 ounces of punch.
So, x+2x +8x = 176
11x = 176
x =

x = 16.
Amount of cranberry juice = 16
Amount of orange juice = 2x = 2 x 16 = 32
Amount of ginger ale = 8x = 8 x 16 = 128