Finding the Fourth Proportional to 2,399.38, 3,311.13 and 1,351.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.38 : 3,311.13 = 1,351.78 : x
2. Step 2: Convert to fraction form
   2,399.38/3,311.13 = 1,351.78/x
3. Step 3: Cross multiply
   2,399.38x = 3,311.13 × 1,351.78
4. Step 4: Simplify right side
   2,399.38x = 4,475,919.31
5. Step 5: Solve for x
   x = 4,475,919.31/2,399.38
6. Step 6: Final answer
   x = 1,865.45