Finding the Fourth Proportional to 2,508.89, 3,763.63 and 865.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,508.89 : 3,763.63 = 865.80 : x
2. Step 2: Convert to fraction form
   2,508.89/3,763.63 = 865.80/x
3. Step 3: Cross multiply
   2,508.89x = 3,763.63 × 865.80
4. Step 4: Simplify right side
   2,508.89x = 3,258,550.85
5. Step 5: Solve for x
   x = 3,258,550.85/2,508.89
6. Step 6: Final answer
   x = 1,298.80