Finding the Fourth Proportional to 2,626.20, 3,939.35 and 777.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.20 : 3,939.35 = 777.29 : x
2. Step 2: Convert to fraction form
   2,626.20/3,939.35 = 777.29/x
3. Step 3: Cross multiply
   2,626.20x = 3,939.35 × 777.29
4. Step 4: Simplify right side
   2,626.20x = 3,061,993.78
5. Step 5: Solve for x
   x = 3,061,993.78/2,626.20
6. Step 6: Final answer
   x = 1,165.94