Finding the Fourth Proportional to 22,716.50, 31,348.76 and 12,644.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,716.50 : 31,348.76 = 12,644.72 : x
2. Step 2: Convert to fraction form
   22,716.50/31,348.76 = 12,644.72/x
3. Step 3: Cross multiply
   22,716.50x = 31,348.76 × 12,644.72
4. Step 4: Simplify right side
   22,716.50x = 396,396,292.55
5. Step 5: Solve for x
   x = 396,396,292.55/22,716.50
6. Step 6: Final answer
   x = 17,449.71