Finding the Fourth Proportional to 3,866.85, 5,766.30 and 3,831.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,866.85 : 5,766.30 = 3,831.75 : x
2. Step 2: Convert to fraction form
   3,866.85/5,766.30 = 3,831.75/x
3. Step 3: Cross multiply
   3,866.85x = 5,766.30 × 3,831.75
4. Step 4: Simplify right side
   3,866.85x = 22,095,020.03
5. Step 5: Solve for x
   x = 22,095,020.03/3,866.85
6. Step 6: Final answer
   x = 5,713.96