Finding the Third Proportional to 144,235 and 315,616

Step by Step Solution

1. Step 1: Write the proportion equation
   144,235 : 315,616 = 315,616 : x
2. Step 2: Convert to fraction form
   144,235/315,616 = 315,616/x
3. Step 3: Cross multiply
   144,235x = 315,616 × 315,616
4. Step 4: Simplify right side
   144,235x = 99,613,459,456
5. Step 5: Solve for x
   x = 99,613,459,456/144,235
6. Step 6: Final answer
   x = 690,633.06