Finding the Fourth Proportional to 129,003.42, 178,024.59 and 72,414.90

Step by Step Solution

1. Step 1: Write the proportion equation
   129,003.42 : 178,024.59 = 72,414.90 : x
2. Step 2: Convert to fraction form
   129,003.42/178,024.59 = 72,414.90/x
3. Step 3: Cross multiply
   129,003.42x = 178,024.59 × 72,414.90
4. Step 4: Simplify right side
   129,003.42x = 12,891,632,882.39
5. Step 5: Solve for x
   x = 12,891,632,882.39/129,003.42
6. Step 6: Final answer
   x = 99,932.49