Finding the Fourth Proportional to 22,399.43, 30,911.48 and 12,839.73

Step by Step Solution

1. Step 1: Write the proportion equation
   22,399.43 : 30,911.48 = 12,839.73 : x
2. Step 2: Convert to fraction form
   22,399.43/30,911.48 = 12,839.73/x
3. Step 3: Cross multiply
   22,399.43x = 30,911.48 × 12,839.73
4. Step 4: Simplify right side
   22,399.43x = 396,894,992.90
5. Step 5: Solve for x
   x = 396,894,992.90/22,399.43
6. Step 6: Final answer
   x = 17,718.98