Finding the Fourth Proportional to 59,715.20, 89,767.20 and 42,305.60

Step by Step Solution

1. Step 1: Write the proportion equation
   59,715.20 : 89,767.20 = 42,305.60 : x
2. Step 2: Convert to fraction form
   59,715.20/89,767.20 = 42,305.60/x
3. Step 3: Cross multiply
   59,715.20x = 89,767.20 × 42,305.60
4. Step 4: Simplify right side
   59,715.20x = 3,797,655,256.32
5. Step 5: Solve for x
   x = 3,797,655,256.32/59,715.20
6. Step 6: Final answer
   x = 63,596.12