Finding the Fourth Proportional to 10,689.27, 16,042.12 and 10,140.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,689.27 : 16,042.12 = 10,140.49 : x
2. Step 2: Convert to fraction form
   10,689.27/16,042.12 = 10,140.49/x
3. Step 3: Cross multiply
   10,689.27x = 16,042.12 × 10,140.49
4. Step 4: Simplify right side
   10,689.27x = 162,674,952.14
5. Step 5: Solve for x
   x = 162,674,952.14/10,689.27
6. Step 6: Final answer
   x = 15,218.53