Finding the Third Proportional to 123,144 and 265,728

Step by Step Solution

1. Step 1: Write the proportion equation
   123,144 : 265,728 = 265,728 : x
2. Step 2: Convert to fraction form
   123,144/265,728 = 265,728/x
3. Step 3: Cross multiply
   123,144x = 265,728 × 265,728
4. Step 4: Simplify right side
   123,144x = 70,611,369,984
5. Step 5: Solve for x
   x = 70,611,369,984/123,144
6. Step 6: Final answer
   x = 573,404.88