Finding the Third Proportional to 142,788 and 309,444

Step by Step Solution

1. Step 1: Write the proportion equation
   142,788 : 309,444 = 309,444 : x
2. Step 2: Convert to fraction form
   142,788/309,444 = 309,444/x
3. Step 3: Cross multiply
   142,788x = 309,444 × 309,444
4. Step 4: Simplify right side
   142,788x = 95,755,589,136
5. Step 5: Solve for x
   x = 95,755,589,136/142,788
6. Step 6: Final answer
   x = 670,613.70