Finding the Third Proportional to 144,504 and 315,144

Step by Step Solution

1. Step 1: Write the proportion equation
   144,504 : 315,144 = 315,144 : x
2. Step 2: Convert to fraction form
   144,504/315,144 = 315,144/x
3. Step 3: Cross multiply
   144,504x = 315,144 × 315,144
4. Step 4: Simplify right side
   144,504x = 99,315,740,736
5. Step 5: Solve for x
   x = 99,315,740,736/144,504
6. Step 6: Final answer
   x = 687,287.14