Finding the Fourth Proportional to 2,185.89, 3,279.15 and 798.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.89 : 3,279.15 = 798.90 : x
2. Step 2: Convert to fraction form
   2,185.89/3,279.15 = 798.90/x
3. Step 3: Cross multiply
   2,185.89x = 3,279.15 × 798.90
4. Step 4: Simplify right side
   2,185.89x = 2,619,692.54
5. Step 5: Solve for x
   x = 2,619,692.54/2,185.89
6. Step 6: Final answer
   x = 1,198.46