Finding the Fourth Proportional to 129,373.48, 178,535.38 and 72,011.57

Step by Step Solution

1. Step 1: Write the proportion equation
   129,373.48 : 178,535.38 = 72,011.57 : x
2. Step 2: Convert to fraction form
   129,373.48/178,535.38 = 72,011.57/x
3. Step 3: Cross multiply
   129,373.48x = 178,535.38 × 72,011.57
4. Step 4: Simplify right side
   129,373.48x = 12,856,612,654.29
5. Step 5: Solve for x
   x = 12,856,612,654.29/129,373.48
6. Step 6: Final answer
   x = 99,375.96