Finding the Fourth Proportional to 2,578.90, 3,558.77 and 1,399.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.90 : 3,558.77 = 1,399.95 : x
2. Step 2: Convert to fraction form
   2,578.90/3,558.77 = 1,399.95/x
3. Step 3: Cross multiply
   2,578.90x = 3,558.77 × 1,399.95
4. Step 4: Simplify right side
   2,578.90x = 4,982,100.06
5. Step 5: Solve for x
   x = 4,982,100.06/2,578.90
6. Step 6: Final answer
   x = 1,931.87