Finding the Third Proportional to 142,600.50 and 307,800

Step by Step Solution

1. Step 1: Write the proportion equation
   142,600.50 : 307,800 = 307,800 : x
2. Step 2: Convert to fraction form
   142,600.50/307,800 = 307,800/x
3. Step 3: Cross multiply
   142,600.50x = 307,800 × 307,800
4. Step 4: Simplify right side
   142,600.50x = 94,740,840,000
5. Step 5: Solve for x
   x = 94,740,840,000/142,600.50
6. Step 6: Final answer
   x = 664,379.44