Finding the Third Proportional to 321,622.50 and 685,959

Step by Step Solution

1. Step 1: Write the proportion equation
   321,622.50 : 685,959 = 685,959 : x
2. Step 2: Convert to fraction form
   321,622.50/685,959 = 685,959/x
3. Step 3: Cross multiply
   321,622.50x = 685,959 × 685,959
4. Step 4: Simplify right side
   321,622.50x = 470,539,749,681
5. Step 5: Solve for x
   x = 470,539,749,681/321,622.50
6. Step 6: Final answer
   x = 1,463,018.76