Finding the Fourth Proportional to 22,863.72, 31,550.21 and 12,790.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,863.72 : 31,550.21 = 12,790.31 : x
2. Step 2: Convert to fraction form
   22,863.72/31,550.21 = 12,790.31/x
3. Step 3: Cross multiply
   22,863.72x = 31,550.21 × 12,790.31
4. Step 4: Simplify right side
   22,863.72x = 403,536,792.73
5. Step 5: Solve for x
   x = 403,536,792.73/22,863.72
6. Step 6: Final answer
   x = 17,649.66