Finding the Fourth Proportional to 16,105.88, 22,231.89 and 12,138.30

Step by Step Solution

1. Step 1: Write the proportion equation
   16,105.88 : 22,231.89 = 12,138.30 : x
2. Step 2: Convert to fraction form
   16,105.88/22,231.89 = 12,138.30/x
3. Step 3: Cross multiply
   16,105.88x = 22,231.89 × 12,138.30
4. Step 4: Simplify right side
   16,105.88x = 269,857,350.39
5. Step 5: Solve for x
   x = 269,857,350.39/16,105.88
6. Step 6: Final answer
   x = 16,755.20