Finding the Third Proportional to 142,636 and 220,866

Step by Step Solution

1. Step 1: Write the proportion equation
   142,636 : 220,866 = 220,866 : x
2. Step 2: Convert to fraction form
   142,636/220,866 = 220,866/x
3. Step 3: Cross multiply
   142,636x = 220,866 × 220,866
4. Step 4: Simplify right side
   142,636x = 48,781,789,956
5. Step 5: Solve for x
   x = 48,781,789,956/142,636
6. Step 6: Final answer
   x = 342,001.95