Finding the Third Proportional to 215,239 and 300,920

Step by Step Solution

1. Step 1: Write the proportion equation
   215,239 : 300,920 = 300,920 : x
2. Step 2: Convert to fraction form
   215,239/300,920 = 300,920/x
3. Step 3: Cross multiply
   215,239x = 300,920 × 300,920
4. Step 4: Simplify right side
   215,239x = 90,552,846,400
5. Step 5: Solve for x
   x = 90,552,846,400/215,239
6. Step 6: Final answer
   x = 420,708.36