Finding the Fourth Proportional to 2,578.27, 3,557.92 and 1,399.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.27 : 3,557.92 = 1,399.32 : x
2. Step 2: Convert to fraction form
   2,578.27/3,557.92 = 1,399.32/x
3. Step 3: Cross multiply
   2,578.27x = 3,557.92 × 1,399.32
4. Step 4: Simplify right side
   2,578.27x = 4,978,643.83
5. Step 5: Solve for x
   x = 4,978,643.83/2,578.27
6. Step 6: Final answer
   x = 1,931.00