Finding the Third Proportional to 142,642 and 220,751

Step by Step Solution

1. Step 1: Write the proportion equation
   142,642 : 220,751 = 220,751 : x
2. Step 2: Convert to fraction form
   142,642/220,751 = 220,751/x
3. Step 3: Cross multiply
   142,642x = 220,751 × 220,751
4. Step 4: Simplify right side
   142,642x = 48,731,004,001
5. Step 5: Solve for x
   x = 48,731,004,001/142,642
6. Step 6: Final answer
   x = 341,631.53