Finding the Third Proportional to 512.72 and 788.06

Step by Step Solution

1. Step 1: Write the proportion equation
   512.72 : 788.06 = 788.06 : x
2. Step 2: Convert to fraction form
   512.72/788.06 = 788.06/x
3. Step 3: Cross multiply
   512.72x = 788.06 × 788.06
4. Step 4: Simplify right side
   512.72x = 621,042.50
5. Step 5: Solve for x
   x = 621,042.50/512.72
6. Step 6: Final answer
   x = 1,211.27