Finding the Fourth Proportional to 2,680.43, 4,019.12 and 831.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.43 : 4,019.12 = 831.02 : x
2. Step 2: Convert to fraction form
   2,680.43/4,019.12 = 831.02/x
3. Step 3: Cross multiply
   2,680.43x = 4,019.12 × 831.02
4. Step 4: Simplify right side
   2,680.43x = 3,339,964.95
5. Step 5: Solve for x
   x = 3,339,964.95/2,680.43
6. Step 6: Final answer
   x = 1,246.06