Finding the Fourth Proportional to 87,730.25, 131,528.27 and 72,691.18

Step by Step Solution

1. Step 1: Write the proportion equation
   87,730.25 : 131,528.27 = 72,691.18 : x
2. Step 2: Convert to fraction form
   87,730.25/131,528.27 = 72,691.18/x
3. Step 3: Cross multiply
   87,730.25x = 131,528.27 × 72,691.18
4. Step 4: Simplify right side
   87,730.25x = 9,560,945,002.57
5. Step 5: Solve for x
   x = 9,560,945,002.57/87,730.25
6. Step 6: Final answer
   x = 108,981.17