Finding the Fourth Proportional to 2,642.78, 3,963.01 and 793.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.78 : 3,963.01 = 793.55 : x
2. Step 2: Convert to fraction form
   2,642.78/3,963.01 = 793.55/x
3. Step 3: Cross multiply
   2,642.78x = 3,963.01 × 793.55
4. Step 4: Simplify right side
   2,642.78x = 3,144,846.59
5. Step 5: Solve for x
   x = 3,144,846.59/2,642.78
6. Step 6: Final answer
   x = 1,189.98