Finding the Fourth Proportional to 101,385.88, 139,900.28 and 56,057.76

Step by Step Solution

1. Step 1: Write the proportion equation
   101,385.88 : 139,900.28 = 56,057.76 : x
2. Step 2: Convert to fraction form
   101,385.88/139,900.28 = 56,057.76/x
3. Step 3: Cross multiply
   101,385.88x = 139,900.28 × 56,057.76
4. Step 4: Simplify right side
   101,385.88x = 7,842,496,320.17
5. Step 5: Solve for x
   x = 7,842,496,320.17/101,385.88
6. Step 6: Final answer
   x = 77,352.94