Finding the Fourth Proportional to 12,790.86, 17,650.35 and 7,124.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,790.86 : 17,650.35 = 7,124.91 : x
2. Step 2: Convert to fraction form
   12,790.86/17,650.35 = 7,124.91/x
3. Step 3: Cross multiply
   12,790.86x = 17,650.35 × 7,124.91
4. Step 4: Simplify right side
   12,790.86x = 125,757,155.22
5. Step 5: Solve for x
   x = 125,757,155.22/12,790.86
6. Step 6: Final answer
   x = 9,831.80