Finding the Third Proportional to 143,728 and 311,456

Step by Step Solution

1. Step 1: Write the proportion equation
   143,728 : 311,456 = 311,456 : x
2. Step 2: Convert to fraction form
   143,728/311,456 = 311,456/x
3. Step 3: Cross multiply
   143,728x = 311,456 × 311,456
4. Step 4: Simplify right side
   143,728x = 97,004,839,936
5. Step 5: Solve for x
   x = 97,004,839,936/143,728
6. Step 6: Final answer
   x = 674,919.57