Finding the Fourth Proportional to 22,710.11, 31,339.31 and 12,638.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,710.11 : 31,339.31 = 12,638.16 : x
2. Step 2: Convert to fraction form
   22,710.11/31,339.31 = 12,638.16/x
3. Step 3: Cross multiply
   22,710.11x = 31,339.31 × 12,638.16
4. Step 4: Simplify right side
   22,710.11x = 396,071,150.88
5. Step 5: Solve for x
   x = 396,071,150.88/22,710.11
6. Step 6: Final answer
   x = 17,440.30