Finding the Third Proportional to 317,587.50 and 681,223.50

Step by Step Solution

1. Step 1: Write the proportion equation
   317,587.50 : 681,223.50 = 681,223.50 : x
2. Step 2: Convert to fraction form
   317,587.50/681,223.50 = 681,223.50/x
3. Step 3: Cross multiply
   317,587.50x = 681,223.50 × 681,223.50
4. Step 4: Simplify right side
   317,587.50x = 464,065,456,952.25
5. Step 5: Solve for x
   x = 464,065,456,952.25/317,587.50
6. Step 6: Final answer
   x = 1,461,220.79