Finding the Third Proportional to 323,144 and 687,760

Step by Step Solution

1. Step 1: Write the proportion equation
   323,144 : 687,760 = 687,760 : x
2. Step 2: Convert to fraction form
   323,144/687,760 = 687,760/x
3. Step 3: Cross multiply
   323,144x = 687,760 × 687,760
4. Step 4: Simplify right side
   323,144x = 473,013,817,600
5. Step 5: Solve for x
   x = 473,013,817,600/323,144
6. Step 6: Final answer
   x = 1,463,786.48