Finding the Third Proportional to 144,259.50 and 315,087

Step by Step Solution

1. Step 1: Write the proportion equation
   144,259.50 : 315,087 = 315,087 : x
2. Step 2: Convert to fraction form
   144,259.50/315,087 = 315,087/x
3. Step 3: Cross multiply
   144,259.50x = 315,087 × 315,087
4. Step 4: Simplify right side
   144,259.50x = 99,279,817,569
5. Step 5: Solve for x
   x = 99,279,817,569/144,259.50
6. Step 6: Final answer
   x = 688,202.98