Finding the Fourth Proportional to 3,818.20, 5,278.94 and 2,648.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,818.20 : 5,278.94 = 2,648.04 : x
2. Step 2: Convert to fraction form
   3,818.20/5,278.94 = 2,648.04/x
3. Step 3: Cross multiply
   3,818.20x = 5,278.94 × 2,648.04
4. Step 4: Simplify right side
   3,818.20x = 13,978,844.28
5. Step 5: Solve for x
   x = 13,978,844.28/3,818.20
6. Step 6: Final answer
   x = 3,661.11