Finding the Fourth Proportional to 2,626.09, 3,939.81 and 777.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.09 : 3,939.81 = 777.13 : x
2. Step 2: Convert to fraction form
   2,626.09/3,939.81 = 777.13/x
3. Step 3: Cross multiply
   2,626.09x = 3,939.81 × 777.13
4. Step 4: Simplify right side
   2,626.09x = 3,061,744.55
5. Step 5: Solve for x
   x = 3,061,744.55/2,626.09
6. Step 6: Final answer
   x = 1,165.89