Finding the Third Proportional to 620.72 and 961.31

Step by Step Solution

1. Step 1: Write the proportion equation
   620.72 : 961.31 = 961.31 : x
2. Step 2: Convert to fraction form
   620.72/961.31 = 961.31/x
3. Step 3: Cross multiply
   620.72x = 961.31 × 961.31
4. Step 4: Simplify right side
   620.72x = 924,121.72
5. Step 5: Solve for x
   x = 924,121.72/620.72
6. Step 6: Final answer
   x = 1,488.79