Finding the Fourth Proportional to 12,781.69, 17,637.31 and 7,115.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,781.69 : 17,637.31 = 7,115.13 : x
2. Step 2: Convert to fraction form
   12,781.69/17,637.31 = 7,115.13/x
3. Step 3: Cross multiply
   12,781.69x = 17,637.31 × 7,115.13
4. Step 4: Simplify right side
   12,781.69x = 125,491,735.71
5. Step 5: Solve for x
   x = 125,491,735.71/12,781.69
6. Step 6: Final answer
   x = 9,818.09