Finding the Third Proportional to 571.31 and 1,231.69

Step by Step Solution

1. Step 1: Write the proportion equation
   571.31 : 1,231.69 = 1,231.69 : x
2. Step 2: Convert to fraction form
   571.31/1,231.69 = 1,231.69/x
3. Step 3: Cross multiply
   571.31x = 1,231.69 × 1,231.69
4. Step 4: Simplify right side
   571.31x = 1,517,054.10
5. Step 5: Solve for x
   x = 1,517,054.10/571.31
6. Step 6: Final answer
   x = 2,655.38