Finding the Third Proportional to 20,907 and 42,831

Step by Step Solution

1. Step 1: Write the proportion equation
   20,907 : 42,831 = 42,831 : x
2. Step 2: Convert to fraction form
   20,907/42,831 = 42,831/x
3. Step 3: Cross multiply
   20,907x = 42,831 × 42,831
4. Step 4: Simplify right side
   20,907x = 1,834,494,561
5. Step 5: Solve for x
   x = 1,834,494,561/20,907
6. Step 6: Final answer
   x = 87,745.47