Finding the Third Proportional to 142,405 and 303,215

Step by Step Solution

1. Step 1: Write the proportion equation
   142,405 : 303,215 = 303,215 : x
2. Step 2: Convert to fraction form
   142,405/303,215 = 303,215/x
3. Step 3: Cross multiply
   142,405x = 303,215 × 303,215
4. Step 4: Simplify right side
   142,405x = 91,939,336,225
5. Step 5: Solve for x
   x = 91,939,336,225/142,405
6. Step 6: Final answer
   x = 645,618.74