Finding the Fourth Proportional to 22,763.12, 31,410.12 and 12,689.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,763.12 : 31,410.12 = 12,689.12 : x
2. Step 2: Convert to fraction form
   22,763.12/31,410.12 = 12,689.12/x
3. Step 3: Cross multiply
   22,763.12x = 31,410.12 × 12,689.12
4. Step 4: Simplify right side
   22,763.12x = 398,566,781.89
5. Step 5: Solve for x
   x = 398,566,781.89/22,763.12
6. Step 6: Final answer
   x = 17,509.32