Finding the Third Proportional to 631.50 and 921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   631.50 : 921.50 = 921.50 : x
2. Step 2: Convert to fraction form
   631.50/921.50 = 921.50/x
3. Step 3: Cross multiply
   631.50x = 921.50 × 921.50
4. Step 4: Simplify right side
   631.50x = 849,162.25
5. Step 5: Solve for x
   x = 849,162.25/631.50
6. Step 6: Final answer
   x = 1,344.67