Finding the Fourth Proportional to 2,831.52, 3,906.42 and 2,087.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,831.52 : 3,906.42 = 2,087.25 : x
2. Step 2: Convert to fraction form
   2,831.52/3,906.42 = 2,087.25/x
3. Step 3: Cross multiply
   2,831.52x = 3,906.42 × 2,087.25
4. Step 4: Simplify right side
   2,831.52x = 8,153,675.15
5. Step 5: Solve for x
   x = 8,153,675.15/2,831.52
6. Step 6: Final answer
   x = 2,879.61