Finding the Third Proportional to 300,678.50 and 648,008

Step by Step Solution

1. Step 1: Write the proportion equation
   300,678.50 : 648,008 = 648,008 : x
2. Step 2: Convert to fraction form
   300,678.50/648,008 = 648,008/x
3. Step 3: Cross multiply
   300,678.50x = 648,008 × 648,008
4. Step 4: Simplify right side
   300,678.50x = 419,914,368,064
5. Step 5: Solve for x
   x = 419,914,368,064/300,678.50
6. Step 6: Final answer
   x = 1,396,556.02