Finding the Fourth Proportional to 2,626.82, 3,939.86 and 778.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.82 : 3,939.86 = 778.13 : x
2. Step 2: Convert to fraction form
   2,626.82/3,939.86 = 778.13/x
3. Step 3: Cross multiply
   2,626.82x = 3,939.86 × 778.13
4. Step 4: Simplify right side
   2,626.82x = 3,065,699.67
5. Step 5: Solve for x
   x = 3,065,699.67/2,626.82
6. Step 6: Final answer
   x = 1,167.08