Finding the Fourth Proportional to 2,562.57, 3,843.72 and 831.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,562.57 : 3,843.72 = 831.20 : x
2. Step 2: Convert to fraction form
   2,562.57/3,843.72 = 831.20/x
3. Step 3: Cross multiply
   2,562.57x = 3,843.72 × 831.20
4. Step 4: Simplify right side
   2,562.57x = 3,194,880.85
5. Step 5: Solve for x
   x = 3,194,880.85/2,562.57
6. Step 6: Final answer
   x = 1,246.75