Finding the Third Proportional to 13,662 and 20,859

Step by Step Solution

1. Step 1: Write the proportion equation
   13,662 : 20,859 = 20,859 : x
2. Step 2: Convert to fraction form
   13,662/20,859 = 20,859/x
3. Step 3: Cross multiply
   13,662x = 20,859 × 20,859
4. Step 4: Simplify right side
   13,662x = 435,097,881
5. Step 5: Solve for x
   x = 435,097,881/13,662
6. Step 6: Final answer
   x = 31,847.31