Finding the Third Proportional to 142,520.50 and 309,683

Step by Step Solution

1. Step 1: Write the proportion equation
   142,520.50 : 309,683 = 309,683 : x
2. Step 2: Convert to fraction form
   142,520.50/309,683 = 309,683/x
3. Step 3: Cross multiply
   142,520.50x = 309,683 × 309,683
4. Step 4: Simplify right side
   142,520.50x = 95,903,560,489
5. Step 5: Solve for x
   x = 95,903,560,489/142,520.50
6. Step 6: Final answer
   x = 672,910.64