Finding the Fourth Proportional to 72,221.38, 99,665.17 and 40,390.41

Step by Step Solution

1. Step 1: Write the proportion equation
   72,221.38 : 99,665.17 = 40,390.41 : x
2. Step 2: Convert to fraction form
   72,221.38/99,665.17 = 40,390.41/x
3. Step 3: Cross multiply
   72,221.38x = 99,665.17 × 40,390.41
4. Step 4: Simplify right side
   72,221.38x = 4,025,517,079.02
5. Step 5: Solve for x
   x = 4,025,517,079.02/72,221.38
6. Step 6: Final answer
   x = 55,738.58