Finding the Fourth Proportional to 8,462.43, 12,686.76 and 5,680.62

Step by Step Solution

1. Step 1: Write the proportion equation
   8,462.43 : 12,686.76 = 5,680.62 : x
2. Step 2: Convert to fraction form
   8,462.43/12,686.76 = 5,680.62/x
3. Step 3: Cross multiply
   8,462.43x = 12,686.76 × 5,680.62
4. Step 4: Simplify right side
   8,462.43x = 72,068,662.59
5. Step 5: Solve for x
   x = 72,068,662.59/8,462.43
6. Step 6: Final answer
   x = 8,516.31