Finding the Third Proportional to 210,238 and 317,870

Step by Step Solution

1. Step 1: Write the proportion equation
   210,238 : 317,870 = 317,870 : x
2. Step 2: Convert to fraction form
   210,238/317,870 = 317,870/x
3. Step 3: Cross multiply
   210,238x = 317,870 × 317,870
4. Step 4: Simplify right side
   210,238x = 101,041,336,900
5. Step 5: Solve for x
   x = 101,041,336,900/210,238
6. Step 6: Final answer
   x = 480,604.54