Finding the Fourth Proportional to 21,198.18, 31,793.17 and 10,665.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,198.18 : 31,793.17 = 10,665.38 : x
2. Step 2: Convert to fraction form
   21,198.18/31,793.17 = 10,665.38/x
3. Step 3: Cross multiply
   21,198.18x = 31,793.17 × 10,665.38
4. Step 4: Simplify right side
   21,198.18x = 339,086,371.98
5. Step 5: Solve for x
   x = 339,086,371.98/21,198.18
6. Step 6: Final answer
   x = 15,996.01