Finding the Fourth Proportional to 10,491.31, 15,808.71 and 8,682.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,491.31 : 15,808.71 = 8,682.31 : x
2. Step 2: Convert to fraction form
   10,491.31/15,808.71 = 8,682.31/x
3. Step 3: Cross multiply
   10,491.31x = 15,808.71 × 8,682.31
4. Step 4: Simplify right side
   10,491.31x = 137,256,120.92
5. Step 5: Solve for x
   x = 137,256,120.92/10,491.31
6. Step 6: Final answer
   x = 13,082.84