Finding the Fourth Proportional to 2,831.92, 3,909.96 and 2,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,831.92 : 3,909.96 = 2,086.72 : x
2. Step 2: Convert to fraction form
   2,831.92/3,909.96 = 2,086.72/x
3. Step 3: Cross multiply
   2,831.92x = 3,909.96 × 2,086.72
4. Step 4: Simplify right side
   2,831.92x = 8,158,991.73
5. Step 5: Solve for x
   x = 8,158,991.73/2,831.92
6. Step 6: Final answer
   x = 2,881.08