Finding the Third Proportional to 143,540 and 213,669

Step by Step Solution

1. Step 1: Write the proportion equation
   143,540 : 213,669 = 213,669 : x
2. Step 2: Convert to fraction form
   143,540/213,669 = 213,669/x
3. Step 3: Cross multiply
   143,540x = 213,669 × 213,669
4. Step 4: Simplify right side
   143,540x = 45,654,441,561
5. Step 5: Solve for x
   x = 45,654,441,561/143,540
6. Step 6: Final answer
   x = 318,060.76