Finding the Fourth Proportional to 2,616.54, 3,610.50 and 2,086.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.54 : 3,610.50 = 2,086.80 : x
2. Step 2: Convert to fraction form
   2,616.54/3,610.50 = 2,086.80/x
3. Step 3: Cross multiply
   2,616.54x = 3,610.50 × 2,086.80
4. Step 4: Simplify right side
   2,616.54x = 7,534,391.40
5. Step 5: Solve for x
   x = 7,534,391.40/2,616.54
6. Step 6: Final answer
   x = 2,879.52