Finding the Fourth Proportional to 2,578.00, 3,557.71 and 1,399.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.00 : 3,557.71 = 1,399.07 : x
2. Step 2: Convert to fraction form
   2,578.00/3,557.71 = 1,399.07/x
3. Step 3: Cross multiply
   2,578.00x = 3,557.71 × 1,399.07
4. Step 4: Simplify right side
   2,578.00x = 4,977,469.44
5. Step 5: Solve for x
   x = 4,977,469.44/2,578.00
6. Step 6: Final answer
   x = 1,930.75