Finding the Third Proportional to 10,857 and 20,850

Step by Step Solution

1. Step 1: Write the proportion equation
   10,857 : 20,850 = 20,850 : x
2. Step 2: Convert to fraction form
   10,857/20,850 = 20,850/x
3. Step 3: Cross multiply
   10,857x = 20,850 × 20,850
4. Step 4: Simplify right side
   10,857x = 434,722,500
5. Step 5: Solve for x
   x = 434,722,500/10,857
6. Step 6: Final answer
   x = 40,040.76