Finding the Fourth Proportional to 2,399.50, 3,311.31 and 1,351.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.50 : 3,311.31 = 1,351.54 : x
2. Step 2: Convert to fraction form
   2,399.50/3,311.31 = 1,351.54/x
3. Step 3: Cross multiply
   2,399.50x = 3,311.31 × 1,351.54
4. Step 4: Simplify right side
   2,399.50x = 4,475,367.92
5. Step 5: Solve for x
   x = 4,475,367.92/2,399.50
6. Step 6: Final answer
   x = 1,865.13