Finding the Fourth Proportional to 2,680.29, 4,019.83 and 831.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.29 : 4,019.83 = 831.36 : x
2. Step 2: Convert to fraction form
   2,680.29/4,019.83 = 831.36/x
3. Step 3: Cross multiply
   2,680.29x = 4,019.83 × 831.36
4. Step 4: Simplify right side
   2,680.29x = 3,341,938.86
5. Step 5: Solve for x
   x = 3,341,938.86/2,680.29
6. Step 6: Final answer
   x = 1,246.86