Finding the Fourth Proportional to 12,540.72, 17,306.39 and 7,505.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,540.72 : 17,306.39 = 7,505.15 : x
2. Step 2: Convert to fraction form
   12,540.72/17,306.39 = 7,505.15/x
3. Step 3: Cross multiply
   12,540.72x = 17,306.39 × 7,505.15
4. Step 4: Simplify right side
   12,540.72x = 129,887,052.91
5. Step 5: Solve for x
   x = 129,887,052.91/12,540.72
6. Step 6: Final answer
   x = 10,357.22