Finding the Fourth Proportional to 2,647.89, 3,972.35 and 799.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.89 : 3,972.35 = 799.15 : x
2. Step 2: Convert to fraction form
   2,647.89/3,972.35 = 799.15/x
3. Step 3: Cross multiply
   2,647.89x = 3,972.35 × 799.15
4. Step 4: Simplify right side
   2,647.89x = 3,174,499.51
5. Step 5: Solve for x
   x = 3,174,499.51/2,647.89
6. Step 6: Final answer
   x = 1,198.88