Finding the Fourth Proportional to 2,650.80, 3,978.60 and 2,104.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,650.80 : 3,978.60 = 2,104.56 : x
2. Step 2: Convert to fraction form
   2,650.80/3,978.60 = 2,104.56/x
3. Step 3: Cross multiply
   2,650.80x = 3,978.60 × 2,104.56
4. Step 4: Simplify right side
   2,650.80x = 8,373,202.42
5. Step 5: Solve for x
   x = 8,373,202.42/2,650.80
6. Step 6: Final answer
   x = 3,158.75