Finding the Third Proportional to 21,858 and 31,939

Step by Step Solution

1. Step 1: Write the proportion equation
   21,858 : 31,939 = 31,939 : x
2. Step 2: Convert to fraction form
   21,858/31,939 = 31,939/x
3. Step 3: Cross multiply
   21,858x = 31,939 × 31,939
4. Step 4: Simplify right side
   21,858x = 1,020,099,721
5. Step 5: Solve for x
   x = 1,020,099,721/21,858
6. Step 6: Final answer
   x = 46,669.40