Finding the Third Proportional to 145,914 and 317,388

Step by Step Solution

1. Step 1: Write the proportion equation
   145,914 : 317,388 = 317,388 : x
2. Step 2: Convert to fraction form
   145,914/317,388 = 317,388/x
3. Step 3: Cross multiply
   145,914x = 317,388 × 317,388
4. Step 4: Simplify right side
   145,914x = 100,735,142,544
5. Step 5: Solve for x
   x = 100,735,142,544/145,914
6. Step 6: Final answer
   x = 690,373.39