Finding the Third Proportional to 142,607 and 309,849

Step by Step Solution

1. Step 1: Write the proportion equation
   142,607 : 309,849 = 309,849 : x
2. Step 2: Convert to fraction form
   142,607/309,849 = 309,849/x
3. Step 3: Cross multiply
   142,607x = 309,849 × 309,849
4. Step 4: Simplify right side
   142,607x = 96,006,402,801
5. Step 5: Solve for x
   x = 96,006,402,801/142,607
6. Step 6: Final answer
   x = 673,223.63