Finding the Fourth Proportional to 2,447.38, 3,377.46 and 1,399.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,447.38 : 3,377.46 = 1,399.78 : x
2. Step 2: Convert to fraction form
   2,447.38/3,377.46 = 1,399.78/x
3. Step 3: Cross multiply
   2,447.38x = 3,377.46 × 1,399.78
4. Step 4: Simplify right side
   2,447.38x = 4,727,700.96
5. Step 5: Solve for x
   x = 4,727,700.96/2,447.38
6. Step 6: Final answer
   x = 1,931.74