Finding the Third Proportional to 213,450 and 309,150

Step by Step Solution

1. Step 1: Write the proportion equation
   213,450 : 309,150 = 309,150 : x
2. Step 2: Convert to fraction form
   213,450/309,150 = 309,150/x
3. Step 3: Cross multiply
   213,450x = 309,150 × 309,150
4. Step 4: Simplify right side
   213,450x = 95,573,722,500
5. Step 5: Solve for x
   x = 95,573,722,500/213,450
6. Step 6: Final answer
   x = 447,756.96