Finding the Fourth Proportional to 2,831.56, 4,243.08 and 2,561.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,831.56 : 4,243.08 = 2,561.82 : x
2. Step 2: Convert to fraction form
   2,831.56/4,243.08 = 2,561.82/x
3. Step 3: Cross multiply
   2,831.56x = 4,243.08 × 2,561.82
4. Step 4: Simplify right side
   2,831.56x = 10,870,007.21
5. Step 5: Solve for x
   x = 10,870,007.21/2,831.56
6. Step 6: Final answer
   x = 3,838.88