Finding the Fourth Proportional to 12,399.12, 17,081.28 and 10,409.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.12 : 17,081.28 = 10,409.04 : x
2. Step 2: Convert to fraction form
   12,399.12/17,081.28 = 10,409.04/x
3. Step 3: Cross multiply
   12,399.12x = 17,081.28 × 10,409.04
4. Step 4: Simplify right side
   12,399.12x = 177,799,726.77
5. Step 5: Solve for x
   x = 177,799,726.77/12,399.12
6. Step 6: Final answer
   x = 14,339.71