Finding the Third Proportional to 13,666 and 20,890

Step by Step Solution

1. Step 1: Write the proportion equation
   13,666 : 20,890 = 20,890 : x
2. Step 2: Convert to fraction form
   13,666/20,890 = 20,890/x
3. Step 3: Cross multiply
   13,666x = 20,890 × 20,890
4. Step 4: Simplify right side
   13,666x = 436,392,100
5. Step 5: Solve for x
   x = 436,392,100/13,666
6. Step 6: Final answer
   x = 31,932.69