Finding the Fourth Proportional to 3,968.72, 5,952.72 and 1,779.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968.72 : 5,952.72 = 1,779.20 : x
2. Step 2: Convert to fraction form
   3,968.72/5,952.72 = 1,779.20/x
3. Step 3: Cross multiply
   3,968.72x = 5,952.72 × 1,779.20
4. Step 4: Simplify right side
   3,968.72x = 10,591,079.42
5. Step 5: Solve for x
   x = 10,591,079.42/3,968.72
6. Step 6: Final answer
   x = 2,668.64