Finding the Fourth Proportional to 2,578.08, 3,557.82 and 1,399.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.08 : 3,557.82 = 1,399.22 : x
2. Step 2: Convert to fraction form
   2,578.08/3,557.82 = 1,399.22/x
3. Step 3: Cross multiply
   2,578.08x = 3,557.82 × 1,399.22
4. Step 4: Simplify right side
   2,578.08x = 4,978,193.71
5. Step 5: Solve for x
   x = 4,978,193.71/2,578.08
6. Step 6: Final answer
   x = 1,930.97