Finding the Fourth Proportional to 2,610.34, 3,915.72 and 831.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.34 : 3,915.72 = 831.18 : x
2. Step 2: Convert to fraction form
   2,610.34/3,915.72 = 831.18/x
3. Step 3: Cross multiply
   2,610.34x = 3,915.72 × 831.18
4. Step 4: Simplify right side
   2,610.34x = 3,254,668.15
5. Step 5: Solve for x
   x = 3,254,668.15/2,610.34
6. Step 6: Final answer
   x = 1,246.84