Finding the Third Proportional to 142,889 and 215,630

Step by Step Solution

1. Step 1: Write the proportion equation
   142,889 : 215,630 = 215,630 : x
2. Step 2: Convert to fraction form
   142,889/215,630 = 215,630/x
3. Step 3: Cross multiply
   142,889x = 215,630 × 215,630
4. Step 4: Simplify right side
   142,889x = 46,496,296,900
5. Step 5: Solve for x
   x = 46,496,296,900/142,889
6. Step 6: Final answer
   x = 325,401.51