Finding the Fourth Proportional to 2,766.78, 4,149.90 and 918.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,766.78 : 4,149.90 = 918.09 : x
2. Step 2: Convert to fraction form
   2,766.78/4,149.90 = 918.09/x
3. Step 3: Cross multiply
   2,766.78x = 4,149.90 × 918.09
4. Step 4: Simplify right side
   2,766.78x = 3,809,981.69
5. Step 5: Solve for x
   x = 3,809,981.69/2,766.78
6. Step 6: Final answer
   x = 1,377.05