Finding the Third Proportional to 142,405 and 303,218

Step by Step Solution

1. Step 1: Write the proportion equation
   142,405 : 303,218 = 303,218 : x
2. Step 2: Convert to fraction form
   142,405/303,218 = 303,218/x
3. Step 3: Cross multiply
   142,405x = 303,218 × 303,218
4. Step 4: Simplify right side
   142,405x = 91,941,155,524
5. Step 5: Solve for x
   x = 91,941,155,524/142,405
6. Step 6: Final answer
   x = 645,631.51