Finding the Fourth Proportional to 2,640.01, 3,958.89 and 791.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.01 : 3,958.89 = 791.38 : x
2. Step 2: Convert to fraction form
   2,640.01/3,958.89 = 791.38/x
3. Step 3: Cross multiply
   2,640.01x = 3,958.89 × 791.38
4. Step 4: Simplify right side
   2,640.01x = 3,132,986.37
5. Step 5: Solve for x
   x = 3,132,986.37/2,640.01
6. Step 6: Final answer
   x = 1,186.74