Finding the Third Proportional to 57,455 and 86,238

Step by Step Solution

1. Step 1: Write the proportion equation
   57,455 : 86,238 = 86,238 : x
2. Step 2: Convert to fraction form
   57,455/86,238 = 86,238/x
3. Step 3: Cross multiply
   57,455x = 86,238 × 86,238
4. Step 4: Simplify right side
   57,455x = 7,436,992,644
5. Step 5: Solve for x
   x = 7,436,992,644/57,455
6. Step 6: Final answer
   x = 129,440.30