Finding the Fourth Proportional to 12,781.69, 17,637.33 and 7,115.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,781.69 : 17,637.33 = 7,115.56 : x
2. Step 2: Convert to fraction form
   12,781.69/17,637.33 = 7,115.56/x
3. Step 3: Cross multiply
   12,781.69x = 17,637.33 × 7,115.56
4. Step 4: Simplify right side
   12,781.69x = 125,499,479.85
5. Step 5: Solve for x
   x = 125,499,479.85/12,781.69
6. Step 6: Final answer
   x = 9,818.69