Finding the Third Proportional to 143,885 and 213,036

Step by Step Solution

1. Step 1: Write the proportion equation
   143,885 : 213,036 = 213,036 : x
2. Step 2: Convert to fraction form
   143,885/213,036 = 213,036/x
3. Step 3: Cross multiply
   143,885x = 213,036 × 213,036
4. Step 4: Simplify right side
   143,885x = 45,384,337,296
5. Step 5: Solve for x
   x = 45,384,337,296/143,885
6. Step 6: Final answer
   x = 315,420.91