Finding the Fourth Proportional to 22,709.60, 31,338.96 and 12,638

Step by Step Solution

1. Step 1: Write the proportion equation
   22,709.60 : 31,338.96 = 12,638 : x
2. Step 2: Convert to fraction form
   22,709.60/31,338.96 = 12,638/x
3. Step 3: Cross multiply
   22,709.60x = 31,338.96 × 12,638
4. Step 4: Simplify right side
   22,709.60x = 396,061,776.48
5. Step 5: Solve for x
   x = 396,061,776.48/22,709.60
6. Step 6: Final answer
   x = 17,440.28