Finding the Fourth Proportional to 11,525.59, 15,906.07 and 8,687.96

Step by Step Solution

1. Step 1: Write the proportion equation
   11,525.59 : 15,906.07 = 8,687.96 : x
2. Step 2: Convert to fraction form
   11,525.59/15,906.07 = 8,687.96/x
3. Step 3: Cross multiply
   11,525.59x = 15,906.07 × 8,687.96
4. Step 4: Simplify right side
   11,525.59x = 138,191,290.89
5. Step 5: Solve for x
   x = 138,191,290.89/11,525.59
6. Step 6: Final answer
   x = 11,989.95