Finding the Third Proportional to 216,500 and 323,870

Step by Step Solution

1. Step 1: Write the proportion equation
   216,500 : 323,870 = 323,870 : x
2. Step 2: Convert to fraction form
   216,500/323,870 = 323,870/x
3. Step 3: Cross multiply
   216,500x = 323,870 × 323,870
4. Step 4: Simplify right side
   216,500x = 104,891,776,900
5. Step 5: Solve for x
   x = 104,891,776,900/216,500
6. Step 6: Final answer
   x = 484,488.58