Finding the Fourth Proportional to 12,810.72, 17,679.15 and 7,505.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,810.72 : 17,679.15 = 7,505.76 : x
2. Step 2: Convert to fraction form
   12,810.72/17,679.15 = 7,505.76/x
3. Step 3: Cross multiply
   12,810.72x = 17,679.15 × 7,505.76
4. Step 4: Simplify right side
   12,810.72x = 132,695,456.90
5. Step 5: Solve for x
   x = 132,695,456.90/12,810.72
6. Step 6: Final answer
   x = 10,358.16