Finding the Third Proportional to 213,300 and 321,300

Step by Step Solution

1. Step 1: Write the proportion equation
   213,300 : 321,300 = 321,300 : x
2. Step 2: Convert to fraction form
   213,300/321,300 = 321,300/x
3. Step 3: Cross multiply
   213,300x = 321,300 × 321,300
4. Step 4: Simplify right side
   213,300x = 103,233,690,000
5. Step 5: Solve for x
   x = 103,233,690,000/213,300
6. Step 6: Final answer
   x = 483,983.54