Finding the Third Proportional to 142,272 and 309,600

Step by Step Solution

1. Step 1: Write the proportion equation
   142,272 : 309,600 = 309,600 : x
2. Step 2: Convert to fraction form
   142,272/309,600 = 309,600/x
3. Step 3: Cross multiply
   142,272x = 309,600 × 309,600
4. Step 4: Simplify right side
   142,272x = 95,852,160,000
5. Step 5: Solve for x
   x = 95,852,160,000/142,272
6. Step 6: Final answer
   x = 673,724.70