Finding the Fourth Proportional to 2,578.43, 3,558.25 and 1,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.43 : 3,558.25 = 1,399.50 : x
2. Step 2: Convert to fraction form
   2,578.43/3,558.25 = 1,399.50/x
3. Step 3: Cross multiply
   2,578.43x = 3,558.25 × 1,399.50
4. Step 4: Simplify right side
   2,578.43x = 4,979,780.72
5. Step 5: Solve for x
   x = 4,979,780.72/2,578.43
6. Step 6: Final answer
   x = 1,931.33