Finding the Fourth Proportional to 22,709.43, 31,339.71 and 12,638.43

Step by Step Solution

1. Step 1: Write the proportion equation
   22,709.43 : 31,339.71 = 12,638.43 : x
2. Step 2: Convert to fraction form
   22,709.43/31,339.71 = 12,638.43/x
3. Step 3: Cross multiply
   22,709.43x = 31,339.71 × 12,638.43
4. Step 4: Simplify right side
   22,709.43x = 396,084,731.06
5. Step 5: Solve for x
   x = 396,084,731.06/22,709.43
6. Step 6: Final answer
   x = 17,441.42