Finding the Third Proportional to 144,229.50 and 315,604

Step by Step Solution

1. Step 1: Write the proportion equation
   144,229.50 : 315,604 = 315,604 : x
2. Step 2: Convert to fraction form
   144,229.50/315,604 = 315,604/x
3. Step 3: Cross multiply
   144,229.50x = 315,604 × 315,604
4. Step 4: Simplify right side
   144,229.50x = 99,605,884,816
5. Step 5: Solve for x
   x = 99,605,884,816/144,229.50
6. Step 6: Final answer
   x = 690,606.88