Finding the Third Proportional to 317,304 and 678,885.75

Step by Step Solution

1. Step 1: Write the proportion equation
   317,304 : 678,885.75 = 678,885.75 : x
2. Step 2: Convert to fraction form
   317,304/678,885.75 = 678,885.75/x
3. Step 3: Cross multiply
   317,304x = 678,885.75 × 678,885.75
4. Step 4: Simplify right side
   317,304x = 460,885,861,553.06
5. Step 5: Solve for x
   x = 460,885,861,553.06/317,304
6. Step 6: Final answer
   x = 1,452,505.68