Finding the Fourth Proportional to 2,806.05, 4,191.39 and 2,728.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,806.05 : 4,191.39 = 2,728.29 : x
2. Step 2: Convert to fraction form
   2,806.05/4,191.39 = 2,728.29/x
3. Step 3: Cross multiply
   2,806.05x = 4,191.39 × 2,728.29
4. Step 4: Simplify right side
   2,806.05x = 11,435,327.42
5. Step 5: Solve for x
   x = 11,435,327.42/2,806.05
6. Step 6: Final answer
   x = 4,075.24