Finding the Fourth Proportional to 22,756.60, 31,404.24 and 12,685.68

Step by Step Solution

1. Step 1: Write the proportion equation
   22,756.60 : 31,404.24 = 12,685.68 : x
2. Step 2: Convert to fraction form
   22,756.60/31,404.24 = 12,685.68/x
3. Step 3: Cross multiply
   22,756.60x = 31,404.24 × 12,685.68
4. Step 4: Simplify right side
   22,756.60x = 398,384,139.28
5. Step 5: Solve for x
   x = 398,384,139.28/22,756.60
6. Step 6: Final answer
   x = 17,506.31