Finding the Third Proportional to 142,326 and 309,708

Step by Step Solution

1. Step 1: Write the proportion equation
   142,326 : 309,708 = 309,708 : x
2. Step 2: Convert to fraction form
   142,326/309,708 = 309,708/x
3. Step 3: Cross multiply
   142,326x = 309,708 × 309,708
4. Step 4: Simplify right side
   142,326x = 95,919,045,264
5. Step 5: Solve for x
   x = 95,919,045,264/142,326
6. Step 6: Final answer
   x = 673,939.02