Finding the Fourth Proportional to 2,643.78, 3,964.51 and 794.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.78 : 3,964.51 = 794.55 : x
2. Step 2: Convert to fraction form
   2,643.78/3,964.51 = 794.55/x
3. Step 3: Cross multiply
   2,643.78x = 3,964.51 × 794.55
4. Step 4: Simplify right side
   2,643.78x = 3,150,001.42
5. Step 5: Solve for x
   x = 3,150,001.42/2,643.78
6. Step 6: Final answer
   x = 1,191.48