Finding the Fourth Proportional to 22,343.35, 30,831.89 and 12,781.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,343.35 : 30,831.89 = 12,781.30 : x
2. Step 2: Convert to fraction form
   22,343.35/30,831.89 = 12,781.30/x
3. Step 3: Cross multiply
   22,343.35x = 30,831.89 × 12,781.30
4. Step 4: Simplify right side
   22,343.35x = 394,071,635.66
5. Step 5: Solve for x
   x = 394,071,635.66/22,343.35
6. Step 6: Final answer
   x = 17,637.09