Finding the Third Proportional to 143,831 and 215,638

Step by Step Solution

1. Step 1: Write the proportion equation
   143,831 : 215,638 = 215,638 : x
2. Step 2: Convert to fraction form
   143,831/215,638 = 215,638/x
3. Step 3: Cross multiply
   143,831x = 215,638 × 215,638
4. Step 4: Simplify right side
   143,831x = 46,499,747,044
5. Step 5: Solve for x
   x = 46,499,747,044/143,831
6. Step 6: Final answer
   x = 323,294.33