Finding the Fourth Proportional to 72,454.17, 99,871.23 and 57,115.71

Step by Step Solution

1. Step 1: Write the proportion equation
   72,454.17 : 99,871.23 = 57,115.71 : x
2. Step 2: Convert to fraction form
   72,454.17/99,871.23 = 57,115.71/x
3. Step 3: Cross multiply
   72,454.17x = 99,871.23 × 57,115.71
4. Step 4: Simplify right side
   72,454.17x = 5,704,216,210.02
5. Step 5: Solve for x
   x = 5,704,216,210.02/72,454.17
6. Step 6: Final answer
   x = 78,728.61