Finding the Fourth Proportional to 129,451.42, 178,631.58 and 72,086.41

Step by Step Solution

1. Step 1: Write the proportion equation
   129,451.42 : 178,631.58 = 72,086.41 : x
2. Step 2: Convert to fraction form
   129,451.42/178,631.58 = 72,086.41/x
3. Step 3: Cross multiply
   129,451.42x = 178,631.58 × 72,086.41
4. Step 4: Simplify right side
   129,451.42x = 12,876,909,314.83
5. Step 5: Solve for x
   x = 12,876,909,314.83/129,451.42
6. Step 6: Final answer
   x = 99,472.91