Finding the Fourth Proportional to 10,642.29, 15,948.48 and 8,411.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,642.29 : 15,948.48 = 8,411.31 : x
2. Step 2: Convert to fraction form
   10,642.29/15,948.48 = 8,411.31/x
3. Step 3: Cross multiply
   10,642.29x = 15,948.48 × 8,411.31
4. Step 4: Simplify right side
   10,642.29x = 134,147,593.54
5. Step 5: Solve for x
   x = 134,147,593.54/10,642.29
6. Step 6: Final answer
   x = 12,605.15