Finding the Third Proportional to 300,834 and 648,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,834 : 648,688.50 = 648,688.50 : x
2. Step 2: Convert to fraction form
   300,834/648,688.50 = 648,688.50/x
3. Step 3: Cross multiply
   300,834x = 648,688.50 × 648,688.50
4. Step 4: Simplify right side
   300,834x = 420,796,770,032.25
5. Step 5: Solve for x
   x = 420,796,770,032.25/300,834
6. Step 6: Final answer
   x = 1,398,767.33