Finding the Fourth Proportional to 2,640.72, 3,961.38 and 791.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.72 : 3,961.38 = 791.94 : x
2. Step 2: Convert to fraction form
   2,640.72/3,961.38 = 791.94/x
3. Step 3: Cross multiply
   2,640.72x = 3,961.38 × 791.94
4. Step 4: Simplify right side
   2,640.72x = 3,137,175.28
5. Step 5: Solve for x
   x = 3,137,175.28/2,640.72
6. Step 6: Final answer
   x = 1,188.00