Finding the Fourth Proportional to 102,259.20, 153,184.56 and 81,234.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,259.20 : 153,184.56 = 81,234.72 : x
2. Step 2: Convert to fraction form
   102,259.20/153,184.56 = 81,234.72/x
3. Step 3: Cross multiply
   102,259.20x = 153,184.56 × 81,234.72
4. Step 4: Simplify right side
   102,259.20x = 12,443,904,839.92
5. Step 5: Solve for x
   x = 12,443,904,839.92/102,259.20
6. Step 6: Final answer
   x = 121,689.83