Finding the Fourth Proportional to 12,789.88, 17,649.77 and 7,124.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.88 : 17,649.77 = 7,124.62 : x
2. Step 2: Convert to fraction form
   12,789.88/17,649.77 = 7,124.62/x
3. Step 3: Cross multiply
   12,789.88x = 17,649.77 × 7,124.62
4. Step 4: Simplify right side
   12,789.88x = 125,747,824.59
5. Step 5: Solve for x
   x = 125,747,824.59/12,789.88
6. Step 6: Final answer
   x = 9,831.82