Finding the Third Proportional to 213,980 and 331,150

Step by Step Solution

1. Step 1: Write the proportion equation
   213,980 : 331,150 = 331,150 : x
2. Step 2: Convert to fraction form
   213,980/331,150 = 331,150/x
3. Step 3: Cross multiply
   213,980x = 331,150 × 331,150
4. Step 4: Simplify right side
   213,980x = 109,660,322,500
5. Step 5: Solve for x
   x = 109,660,322,500/213,980
6. Step 6: Final answer
   x = 512,479.31