Finding the Fourth Proportional to 129,082.50, 178,142.94 and 72,493.92

Step by Step Solution

1. Step 1: Write the proportion equation
   129,082.50 : 178,142.94 = 72,493.92 : x
2. Step 2: Convert to fraction form
   129,082.50/178,142.94 = 72,493.92/x
3. Step 3: Cross multiply
   129,082.50x = 178,142.94 × 72,493.92
4. Step 4: Simplify right side
   129,082.50x = 12,914,280,040.92
5. Step 5: Solve for x
   x = 12,914,280,040.92/129,082.50
6. Step 6: Final answer
   x = 100,046.71