Finding the Fourth Proportional to 129,160.27, 178,234.32 and 72,568

Step by Step Solution

1. Step 1: Write the proportion equation
   129,160.27 : 178,234.32 = 72,568 : x
2. Step 2: Convert to fraction form
   129,160.27/178,234.32 = 72,568/x
3. Step 3: Cross multiply
   129,160.27x = 178,234.32 × 72,568
4. Step 4: Simplify right side
   129,160.27x = 12,934,108,133.76
5. Step 5: Solve for x
   x = 12,934,108,133.76/129,160.27
6. Step 6: Final answer
   x = 100,139.99