Finding the Fourth Proportional to 2,578.74, 3,558.68 and 1,399.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.74 : 3,558.68 = 1,399.83 : x
2. Step 2: Convert to fraction form
   2,578.74/3,558.68 = 1,399.83/x
3. Step 3: Cross multiply
   2,578.74x = 3,558.68 × 1,399.83
4. Step 4: Simplify right side
   2,578.74x = 4,981,540.03
5. Step 5: Solve for x
   x = 4,981,540.03/2,578.74
6. Step 6: Final answer
   x = 1,931.77