Finding the Third Proportional to 142,288 and 309,632

Step by Step Solution

1. Step 1: Write the proportion equation
   142,288 : 309,632 = 309,632 : x
2. Step 2: Convert to fraction form
   142,288/309,632 = 309,632/x
3. Step 3: Cross multiply
   142,288x = 309,632 × 309,632
4. Step 4: Simplify right side
   142,288x = 95,871,975,424
5. Step 5: Solve for x
   x = 95,871,975,424/142,288
6. Step 6: Final answer
   x = 673,788.20