Finding the Fourth Proportional to 123,120, 169,905.60 and 70,128

Step by Step Solution

1. Step 1: Write the proportion equation
   123,120 : 169,905.60 = 70,128 : x
2. Step 2: Convert to fraction form
   123,120/169,905.60 = 70,128/x
3. Step 3: Cross multiply
   123,120x = 169,905.60 × 70,128
4. Step 4: Simplify right side
   123,120x = 11,915,139,916.80
5. Step 5: Solve for x
   x = 11,915,139,916.80/123,120
6. Step 6: Final answer
   x = 96,776.64