Finding the Fourth Proportional to 22,761.82, 31,411.20 and 12,690.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,761.82 : 31,411.20 = 12,690.16 : x
2. Step 2: Convert to fraction form
   22,761.82/31,411.20 = 12,690.16/x
3. Step 3: Cross multiply
   22,761.82x = 31,411.20 × 12,690.16
4. Step 4: Simplify right side
   22,761.82x = 398,613,153.79
5. Step 5: Solve for x
   x = 398,613,153.79/22,761.82
6. Step 6: Final answer
   x = 17,512.36