Finding the Third Proportional to 664.88 and 1,051.31

Step by Step Solution

1. Step 1: Write the proportion equation
   664.88 : 1,051.31 = 1,051.31 : x
2. Step 2: Convert to fraction form
   664.88/1,051.31 = 1,051.31/x
3. Step 3: Cross multiply
   664.88x = 1,051.31 × 1,051.31
4. Step 4: Simplify right side
   664.88x = 1,105,257.97
5. Step 5: Solve for x
   x = 1,105,257.97/664.88
6. Step 6: Final answer
   x = 1,662.35