Finding the Third Proportional to 144,186.75 and 315,522

Step by Step Solution

1. Step 1: Write the proportion equation
   144,186.75 : 315,522 = 315,522 : x
2. Step 2: Convert to fraction form
   144,186.75/315,522 = 315,522/x
3. Step 3: Cross multiply
   144,186.75x = 315,522 × 315,522
4. Step 4: Simplify right side
   144,186.75x = 99,554,132,484
5. Step 5: Solve for x
   x = 99,554,132,484/144,186.75
6. Step 6: Final answer
   x = 690,452.71