Finding the Fourth Proportional to 129,200.56, 178,275.15 and 71,838.27

Step by Step Solution

1. Step 1: Write the proportion equation
   129,200.56 : 178,275.15 = 71,838.27 : x
2. Step 2: Convert to fraction form
   129,200.56/178,275.15 = 71,838.27/x
3. Step 3: Cross multiply
   129,200.56x = 178,275.15 × 71,838.27
4. Step 4: Simplify right side
   129,200.56x = 12,806,978,359.99
5. Step 5: Solve for x
   x = 12,806,978,359.99/129,200.56
6. Step 6: Final answer
   x = 99,124.79