Finding the Third Proportional to 142,280 and 309,616

Step by Step Solution

1. Step 1: Write the proportion equation
   142,280 : 309,616 = 309,616 : x
2. Step 2: Convert to fraction form
   142,280/309,616 = 309,616/x
3. Step 3: Cross multiply
   142,280x = 309,616 × 309,616
4. Step 4: Simplify right side
   142,280x = 95,862,067,456
5. Step 5: Solve for x
   x = 95,862,067,456/142,280
6. Step 6: Final answer
   x = 673,756.45