Finding the Fourth Proportional to 72,399.52, 99,901.20 and 40,565.92

Step by Step Solution

1. Step 1: Write the proportion equation
   72,399.52 : 99,901.20 = 40,565.92 : x
2. Step 2: Convert to fraction form
   72,399.52/99,901.20 = 40,565.92/x
3. Step 3: Cross multiply
   72,399.52x = 99,901.20 × 40,565.92
4. Step 4: Simplify right side
   72,399.52x = 4,052,584,087.10
5. Step 5: Solve for x
   x = 4,052,584,087.10/72,399.52
6. Step 6: Final answer
   x = 55,975.29