Finding the Third Proportional to 664.31 and 976.50

Step by Step Solution

1. Step 1: Write the proportion equation
   664.31 : 976.50 = 976.50 : x
2. Step 2: Convert to fraction form
   664.31/976.50 = 976.50/x
3. Step 3: Cross multiply
   664.31x = 976.50 × 976.50
4. Step 4: Simplify right side
   664.31x = 953,552.25
5. Step 5: Solve for x
   x = 953,552.25/664.31
6. Step 6: Final answer
   x = 1,435.40