Finding the Third Proportional to 721.69 and 1,559.81

Step by Step Solution

1. Step 1: Write the proportion equation
   721.69 : 1,559.81 = 1,559.81 : x
2. Step 2: Convert to fraction form
   721.69/1,559.81 = 1,559.81/x
3. Step 3: Cross multiply
   721.69x = 1,559.81 × 1,559.81
4. Step 4: Simplify right side
   721.69x = 2,433,015.04
5. Step 5: Solve for x
   x = 2,433,015.04/721.69
6. Step 6: Final answer
   x = 3,371.29