Finding the Third Proportional to 320,530.50 and 685,530

Step by Step Solution

1. Step 1: Write the proportion equation
   320,530.50 : 685,530 = 685,530 : x
2. Step 2: Convert to fraction form
   320,530.50/685,530 = 685,530/x
3. Step 3: Cross multiply
   320,530.50x = 685,530 × 685,530
4. Step 4: Simplify right side
   320,530.50x = 469,951,380,900
5. Step 5: Solve for x
   x = 469,951,380,900/320,530.50
6. Step 6: Final answer
   x = 1,466,167.43