Finding the Fourth Proportional to 2,647.36, 3,970.72 and 699.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.36 : 3,970.72 = 699.72 : x
2. Step 2: Convert to fraction form
   2,647.36/3,970.72 = 699.72/x
3. Step 3: Cross multiply
   2,647.36x = 3,970.72 × 699.72
4. Step 4: Simplify right side
   2,647.36x = 2,778,392.20
5. Step 5: Solve for x
   x = 2,778,392.20/2,647.36
6. Step 6: Final answer
   x = 1,049.50