Finding the Fourth Proportional to 2,279.60, 3,418.69 and 798.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.60 : 3,418.69 = 798.78 : x
2. Step 2: Convert to fraction form
   2,279.60/3,418.69 = 798.78/x
3. Step 3: Cross multiply
   2,279.60x = 3,418.69 × 798.78
4. Step 4: Simplify right side
   2,279.60x = 2,730,781.20
5. Step 5: Solve for x
   x = 2,730,781.20/2,279.60
6. Step 6: Final answer
   x = 1,197.92