Finding the Fourth Proportional to 11,218.38, 15,500.61 and 8,878.29

Step by Step Solution

1. Step 1: Write the proportion equation
   11,218.38 : 15,500.61 = 8,878.29 : x
2. Step 2: Convert to fraction form
   11,218.38/15,500.61 = 8,878.29/x
3. Step 3: Cross multiply
   11,218.38x = 15,500.61 × 8,878.29
4. Step 4: Simplify right side
   11,218.38x = 137,618,910.76
5. Step 5: Solve for x
   x = 137,618,910.76/11,218.38
6. Step 6: Final answer
   x = 12,267.27