Finding the Third Proportional to 199,132 and 315,469

Step by Step Solution

1. Step 1: Write the proportion equation
   199,132 : 315,469 = 315,469 : x
2. Step 2: Convert to fraction form
   199,132/315,469 = 315,469/x
3. Step 3: Cross multiply
   199,132x = 315,469 × 315,469
4. Step 4: Simplify right side
   199,132x = 99,520,689,961
5. Step 5: Solve for x
   x = 99,520,689,961/199,132
6. Step 6: Final answer
   x = 499,772.46