Finding the Fourth Proportional to 2,217.01, 3,325.92 and 831.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.01 : 3,325.92 = 831.31 : x
2. Step 2: Convert to fraction form
   2,217.01/3,325.92 = 831.31/x
3. Step 3: Cross multiply
   2,217.01x = 3,325.92 × 831.31
4. Step 4: Simplify right side
   2,217.01x = 2,764,870.56
5. Step 5: Solve for x
   x = 2,764,870.56/2,217.01
6. Step 6: Final answer
   x = 1,247.12