Finding the Fourth Proportional to 12,788.86, 17,648.39 and 7,124.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,788.86 : 17,648.39 = 7,124.08 : x
2. Step 2: Convert to fraction form
   12,788.86/17,648.39 = 7,124.08/x
3. Step 3: Cross multiply
   12,788.86x = 17,648.39 × 7,124.08
4. Step 4: Simplify right side
   12,788.86x = 125,728,464.31
5. Step 5: Solve for x
   x = 125,728,464.31/12,788.86
6. Step 6: Final answer
   x = 9,831.09