Finding the Third Proportional to 142,279 and 300,231

Step by Step Solution

1. Step 1: Write the proportion equation
   142,279 : 300,231 = 300,231 : x
2. Step 2: Convert to fraction form
   142,279/300,231 = 300,231/x
3. Step 3: Cross multiply
   142,279x = 300,231 × 300,231
4. Step 4: Simplify right side
   142,279x = 90,138,653,361
5. Step 5: Solve for x
   x = 90,138,653,361/142,279
6. Step 6: Final answer
   x = 633,534.49