Finding the Third Proportional to 122,857.50 and 258,834

Step by Step Solution

1. Step 1: Write the proportion equation
   122,857.50 : 258,834 = 258,834 : x
2. Step 2: Convert to fraction form
   122,857.50/258,834 = 258,834/x
3. Step 3: Cross multiply
   122,857.50x = 258,834 × 258,834
4. Step 4: Simplify right side
   122,857.50x = 66,995,039,556
5. Step 5: Solve for x
   x = 66,995,039,556/122,857.50
6. Step 6: Final answer
   x = 545,306.88