Finding the Third Proportional to 139,008 and 289,728

Step by Step Solution

1. Step 1: Write the proportion equation
   139,008 : 289,728 = 289,728 : x
2. Step 2: Convert to fraction form
   139,008/289,728 = 289,728/x
3. Step 3: Cross multiply
   139,008x = 289,728 × 289,728
4. Step 4: Simplify right side
   139,008x = 83,942,313,984
5. Step 5: Solve for x
   x = 83,942,313,984/139,008
6. Step 6: Final answer
   x = 603,866.78