Finding the Fourth Proportional to 88,685.28, 122,436.48 and 83,640.64

Step by Step Solution

1. Step 1: Write the proportion equation
   88,685.28 : 122,436.48 = 83,640.64 : x
2. Step 2: Convert to fraction form
   88,685.28/122,436.48 = 83,640.64/x
3. Step 3: Cross multiply
   88,685.28x = 122,436.48 × 83,640.64
4. Step 4: Simplify right side
   88,685.28x = 10,240,665,546.55
5. Step 5: Solve for x
   x = 10,240,665,546.55/88,685.28
6. Step 6: Final answer
   x = 115,471.99