Finding the Fourth Proportional to 3,639.33, 5,028.89 and 2,589.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,639.33 : 5,028.89 = 2,589.57 : x
2. Step 2: Convert to fraction form
   3,639.33/5,028.89 = 2,589.57/x
3. Step 3: Cross multiply
   3,639.33x = 5,028.89 × 2,589.57
4. Step 4: Simplify right side
   3,639.33x = 13,022,649.73
5. Step 5: Solve for x
   x = 13,022,649.73/3,639.33
6. Step 6: Final answer
   x = 3,578.31