Finding the Fourth Proportional to 80,680.80, 121,025.16 and 21,517

Step by Step Solution

1. Step 1: Write the proportion equation
   80,680.80 : 121,025.16 = 21,517 : x
2. Step 2: Convert to fraction form
   80,680.80/121,025.16 = 21,517/x
3. Step 3: Cross multiply
   80,680.80x = 121,025.16 × 21,517
4. Step 4: Simplify right side
   80,680.80x = 2,604,098,367.72
5. Step 5: Solve for x
   x = 2,604,098,367.72/80,680.80
6. Step 6: Final answer
   x = 32,276.56