Finding the Third Proportional to 142,182 and 221,139

Step by Step Solution

1. Step 1: Write the proportion equation
   142,182 : 221,139 = 221,139 : x
2. Step 2: Convert to fraction form
   142,182/221,139 = 221,139/x
3. Step 3: Cross multiply
   142,182x = 221,139 × 221,139
4. Step 4: Simplify right side
   142,182x = 48,902,457,321
5. Step 5: Solve for x
   x = 48,902,457,321/142,182
6. Step 6: Final answer
   x = 343,942.67