Finding the Third Proportional to 300,729 and 648,469.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,729 : 648,469.50 = 648,469.50 : x
2. Step 2: Convert to fraction form
   300,729/648,469.50 = 648,469.50/x
3. Step 3: Cross multiply
   300,729x = 648,469.50 × 648,469.50
4. Step 4: Simplify right side
   300,729x = 420,512,692,430.25
5. Step 5: Solve for x
   x = 420,512,692,430.25/300,729
6. Step 6: Final answer
   x = 1,398,311.08