Finding the Third Proportional to 142,605 and 309,845

Step by Step Solution

1. Step 1: Write the proportion equation
   142,605 : 309,845 = 309,845 : x
2. Step 2: Convert to fraction form
   142,605/309,845 = 309,845/x
3. Step 3: Cross multiply
   142,605x = 309,845 × 309,845
4. Step 4: Simplify right side
   142,605x = 96,003,924,025
5. Step 5: Solve for x
   x = 96,003,924,025/142,605
6. Step 6: Final answer
   x = 673,215.69