Finding the Third Proportional to 13,885 and 20,818

Step by Step Solution

1. Step 1: Write the proportion equation
   13,885 : 20,818 = 20,818 : x
2. Step 2: Convert to fraction form
   13,885/20,818 = 20,818/x
3. Step 3: Cross multiply
   13,885x = 20,818 × 20,818
4. Step 4: Simplify right side
   13,885x = 433,389,124
5. Step 5: Solve for x
   x = 433,389,124/13,885
6. Step 6: Final answer
   x = 31,212.76