Finding the Third Proportional to 663.75 and 1,015.31

Step by Step Solution

1. Step 1: Write the proportion equation
   663.75 : 1,015.31 = 1,015.31 : x
2. Step 2: Convert to fraction form
   663.75/1,015.31 = 1,015.31/x
3. Step 3: Cross multiply
   663.75x = 1,015.31 × 1,015.31
4. Step 4: Simplify right side
   663.75x = 1,030,859.47
5. Step 5: Solve for x
   x = 1,030,859.47/663.75
6. Step 6: Final answer
   x = 1,553.08