Finding the Third Proportional to 13,458 and 20,658

Step by Step Solution

1. Step 1: Write the proportion equation
   13,458 : 20,658 = 20,658 : x
2. Step 2: Convert to fraction form
   13,458/20,658 = 20,658/x
3. Step 3: Cross multiply
   13,458x = 20,658 × 20,658
4. Step 4: Simplify right side
   13,458x = 426,752,964
5. Step 5: Solve for x
   x = 426,752,964/13,458
6. Step 6: Final answer
   x = 31,709.98