Finding the Fourth Proportional to 2,399.78, 3,311.61 and 1,351.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.78 : 3,311.61 = 1,351.82 : x
2. Step 2: Convert to fraction form
   2,399.78/3,311.61 = 1,351.82/x
3. Step 3: Cross multiply
   2,399.78x = 3,311.61 × 1,351.82
4. Step 4: Simplify right side
   2,399.78x = 4,476,700.63
5. Step 5: Solve for x
   x = 4,476,700.63/2,399.78
6. Step 6: Final answer
   x = 1,865.46