Finding the Fourth Proportional to 2,639.98, 3,635.74 and 2,582.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.98 : 3,635.74 = 2,582.57 : x
2. Step 2: Convert to fraction form
   2,639.98/3,635.74 = 2,582.57/x
3. Step 3: Cross multiply
   2,639.98x = 3,635.74 × 2,582.57
4. Step 4: Simplify right side
   2,639.98x = 9,389,530.39
5. Step 5: Solve for x
   x = 9,389,530.39/2,639.98
6. Step 6: Final answer
   x = 3,556.67