Finding the Fourth Proportional to 2,626.07, 3,939.15 and 777.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.07 : 3,939.15 = 777.21 : x
2. Step 2: Convert to fraction form
   2,626.07/3,939.15 = 777.21/x
3. Step 3: Cross multiply
   2,626.07x = 3,939.15 × 777.21
4. Step 4: Simplify right side
   2,626.07x = 3,061,546.77
5. Step 5: Solve for x
   x = 3,061,546.77/2,626.07
6. Step 6: Final answer
   x = 1,165.83