Finding the Third Proportional to 144,146 and 315,444

Step by Step Solution

1. Step 1: Write the proportion equation
   144,146 : 315,444 = 315,444 : x
2. Step 2: Convert to fraction form
   144,146/315,444 = 315,444/x
3. Step 3: Cross multiply
   144,146x = 315,444 × 315,444
4. Step 4: Simplify right side
   144,146x = 99,504,917,136
5. Step 5: Solve for x
   x = 99,504,917,136/144,146
6. Step 6: Final answer
   x = 690,306.47