Finding the Fourth Proportional to 9,104.24, 12,565.46 and 8,688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,104.24 : 12,565.46 = 8,688.72 : x
2. Step 2: Convert to fraction form
   9,104.24/12,565.46 = 8,688.72/x
3. Step 3: Cross multiply
   9,104.24x = 12,565.46 × 8,688.72
4. Step 4: Simplify right side
   9,104.24x = 109,177,763.61
5. Step 5: Solve for x
   x = 109,177,763.61/9,104.24
6. Step 6: Final answer
   x = 11,991.97