Finding the Third Proportional to 142,276 and 309,608

Step by Step Solution

1. Step 1: Write the proportion equation
   142,276 : 309,608 = 309,608 : x
2. Step 2: Convert to fraction form
   142,276/309,608 = 309,608/x
3. Step 3: Cross multiply
   142,276x = 309,608 × 309,608
4. Step 4: Simplify right side
   142,276x = 95,857,113,664
5. Step 5: Solve for x
   x = 95,857,113,664/142,276
6. Step 6: Final answer
   x = 673,740.57