Finding the Fourth Proportional to 102,499.40, 153,657.98 and 55,139.92

Step by Step Solution

1. Step 1: Write the proportion equation
   102,499.40 : 153,657.98 = 55,139.92 : x
2. Step 2: Convert to fraction form
   102,499.40/153,657.98 = 55,139.92/x
3. Step 3: Cross multiply
   102,499.40x = 153,657.98 × 55,139.92
4. Step 4: Simplify right side
   102,499.40x = 8,472,688,724.56
5. Step 5: Solve for x
   x = 8,472,688,724.56/102,499.40
6. Step 6: Final answer
   x = 82,660.86