Finding the Fourth Proportional to 2,648.60, 3,647.67 and 2,591.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.60 : 3,647.67 = 2,591.20 : x
2. Step 2: Convert to fraction form
   2,648.60/3,647.67 = 2,591.20/x
3. Step 3: Cross multiply
   2,648.60x = 3,647.67 × 2,591.20
4. Step 4: Simplify right side
   2,648.60x = 9,451,842.50
5. Step 5: Solve for x
   x = 9,451,842.50/2,648.60
6. Step 6: Final answer
   x = 3,568.62