Finding the Fourth Proportional to 8,707.46, 12,039.92 and 8,566.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,707.46 : 12,039.92 = 8,566.78 : x
2. Step 2: Convert to fraction form
   8,707.46/12,039.92 = 8,566.78/x
3. Step 3: Cross multiply
   8,707.46x = 12,039.92 × 8,566.78
4. Step 4: Simplify right side
   8,707.46x = 103,143,345.86
5. Step 5: Solve for x
   x = 103,143,345.86/8,707.46
6. Step 6: Final answer
   x = 11,845.40