Finding the Fourth Proportional to 129,008.16, 178,030.56 and 72,419.52

Step by Step Solution

1. Step 1: Write the proportion equation
   129,008.16 : 178,030.56 = 72,419.52 : x
2. Step 2: Convert to fraction form
   129,008.16/178,030.56 = 72,419.52/x
3. Step 3: Cross multiply
   129,008.16x = 178,030.56 × 72,419.52
4. Step 4: Simplify right side
   129,008.16x = 12,892,887,700.53
5. Step 5: Solve for x
   x = 12,892,887,700.53/129,008.16
6. Step 6: Final answer
   x = 99,938.54