Finding the Third Proportional to 143,129 and 215,666

Step by Step Solution

1. Step 1: Write the proportion equation
   143,129 : 215,666 = 215,666 : x
2. Step 2: Convert to fraction form
   143,129/215,666 = 215,666/x
3. Step 3: Cross multiply
   143,129x = 215,666 × 215,666
4. Step 4: Simplify right side
   143,129x = 46,511,823,556
5. Step 5: Solve for x
   x = 46,511,823,556/143,129
6. Step 6: Final answer
   x = 324,964.36