Finding the Fourth Proportional to 72,307.08, 99,713.67 and 56,385.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,307.08 : 99,713.67 = 56,385.72 : x
2. Step 2: Convert to fraction form
   72,307.08/99,713.67 = 56,385.72/x
3. Step 3: Cross multiply
   72,307.08x = 99,713.67 × 56,385.72
4. Step 4: Simplify right side
   72,307.08x = 5,622,427,076.79
5. Step 5: Solve for x
   x = 5,622,427,076.79/72,307.08
6. Step 6: Final answer
   x = 77,757.63