Finding the Third Proportional to 300,726 and 648,463.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,726 : 648,463.50 = 648,463.50 : x
2. Step 2: Convert to fraction form
   300,726/648,463.50 = 648,463.50/x
3. Step 3: Cross multiply
   300,726x = 648,463.50 × 648,463.50
4. Step 4: Simplify right side
   300,726x = 420,504,910,832.25
5. Step 5: Solve for x
   x = 420,504,910,832.25/300,726
6. Step 6: Final answer
   x = 1,398,299.15