Finding the Fourth Proportional to 2,647.76, 3,971.57 and 798.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.76 : 3,971.57 = 798.89 : x
2. Step 2: Convert to fraction form
   2,647.76/3,971.57 = 798.89/x
3. Step 3: Cross multiply
   2,647.76x = 3,971.57 × 798.89
4. Step 4: Simplify right side
   2,647.76x = 3,172,823.71
5. Step 5: Solve for x
   x = 3,172,823.71/2,647.76
6. Step 6: Final answer
   x = 1,198.31