Finding the Third Proportional to 306,734 and 628,341.50

Step by Step Solution

1. Step 1: Write the proportion equation
   306,734 : 628,341.50 = 628,341.50 : x
2. Step 2: Convert to fraction form
   306,734/628,341.50 = 628,341.50/x
3. Step 3: Cross multiply
   306,734x = 628,341.50 × 628,341.50
4. Step 4: Simplify right side
   306,734x = 394,813,040,622.25
5. Step 5: Solve for x
   x = 394,813,040,622.25/306,734
6. Step 6: Final answer
   x = 1,287,151.21