Finding the Fourth Proportional to 2,007.20, 3,007.20 and 1,719.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.20 : 3,007.20 = 1,719.20 : x
2. Step 2: Convert to fraction form
   2,007.20/3,007.20 = 1,719.20/x
3. Step 3: Cross multiply
   2,007.20x = 3,007.20 × 1,719.20
4. Step 4: Simplify right side
   2,007.20x = 5,169,978.24
5. Step 5: Solve for x
   x = 5,169,978.24/2,007.20
6. Step 6: Final answer
   x = 2,575.72