Finding the Fourth Proportional to 8,288.68, 12,445.50 and 7,131.29

Step by Step Solution

1. Step 1: Write the proportion equation
   8,288.68 : 12,445.50 = 7,131.29 : x
2. Step 2: Convert to fraction form
   8,288.68/12,445.50 = 7,131.29/x
3. Step 3: Cross multiply
   8,288.68x = 12,445.50 × 7,131.29
4. Step 4: Simplify right side
   8,288.68x = 88,752,464.10
5. Step 5: Solve for x
   x = 88,752,464.10/8,288.68
6. Step 6: Final answer
   x = 10,707.67