Finding the Third Proportional to 142,593 and 309,818.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,593 : 309,818.50 = 309,818.50 : x
2. Step 2: Convert to fraction form
   142,593/309,818.50 = 309,818.50/x
3. Step 3: Cross multiply
   142,593x = 309,818.50 × 309,818.50
4. Step 4: Simplify right side
   142,593x = 95,987,502,942.25
5. Step 5: Solve for x
   x = 95,987,502,942.25/142,593
6. Step 6: Final answer
   x = 673,157.19