Finding the Fourth Proportional to 2,647.18, 3,971.40 and 798.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.18 : 3,971.40 = 798.31 : x
2. Step 2: Convert to fraction form
   2,647.18/3,971.40 = 798.31/x
3. Step 3: Cross multiply
   2,647.18x = 3,971.40 × 798.31
4. Step 4: Simplify right side
   2,647.18x = 3,170,414.78
5. Step 5: Solve for x
   x = 3,170,414.78/2,647.18
6. Step 6: Final answer
   x = 1,197.66