Finding the Third Proportional to 142,588 and 309,810

Step by Step Solution

1. Step 1: Write the proportion equation
   142,588 : 309,810 = 309,810 : x
2. Step 2: Convert to fraction form
   142,588/309,810 = 309,810/x
3. Step 3: Cross multiply
   142,588x = 309,810 × 309,810
4. Step 4: Simplify right side
   142,588x = 95,982,236,100
5. Step 5: Solve for x
   x = 95,982,236,100/142,588
6. Step 6: Final answer
   x = 673,143.86