Finding the Fourth Proportional to 3,993.88, 5,959.58 and 3,578.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,993.88 : 5,959.58 = 3,578.80 : x
2. Step 2: Convert to fraction form
   3,993.88/5,959.58 = 3,578.80/x
3. Step 3: Cross multiply
   3,993.88x = 5,959.58 × 3,578.80
4. Step 4: Simplify right side
   3,993.88x = 21,328,144.90
5. Step 5: Solve for x
   x = 21,328,144.90/3,993.88
6. Step 6: Final answer
   x = 5,340.21