Finding the Third Proportional to 144,190 and 315,530

Step by Step Solution

1. Step 1: Write the proportion equation
   144,190 : 315,530 = 315,530 : x
2. Step 2: Convert to fraction form
   144,190/315,530 = 315,530/x
3. Step 3: Cross multiply
   144,190x = 315,530 × 315,530
4. Step 4: Simplify right side
   144,190x = 99,559,180,900
5. Step 5: Solve for x
   x = 99,559,180,900/144,190
6. Step 6: Final answer
   x = 690,472.16