Finding the Fourth Proportional to 2,627.78, 3,940.49 and 778.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,627.78 : 3,940.49 = 778.24 : x
2. Step 2: Convert to fraction form
   2,627.78/3,940.49 = 778.24/x
3. Step 3: Cross multiply
   2,627.78x = 3,940.49 × 778.24
4. Step 4: Simplify right side
   2,627.78x = 3,066,653.81
5. Step 5: Solve for x
   x = 3,066,653.81/2,627.78
6. Step 6: Final answer
   x = 1,167.02