Finding the Third Proportional to 142,790 and 313,892

Step by Step Solution

1. Step 1: Write the proportion equation
   142,790 : 313,892 = 313,892 : x
2. Step 2: Convert to fraction form
   142,790/313,892 = 313,892/x
3. Step 3: Cross multiply
   142,790x = 313,892 × 313,892
4. Step 4: Simplify right side
   142,790x = 98,528,187,664
5. Step 5: Solve for x
   x = 98,528,187,664/142,790
6. Step 6: Final answer
   x = 690,021.62