Finding the Third Proportional to 13,205 and 20,456

Step by Step Solution

1. Step 1: Write the proportion equation
   13,205 : 20,456 = 20,456 : x
2. Step 2: Convert to fraction form
   13,205/20,456 = 20,456/x
3. Step 3: Cross multiply
   13,205x = 20,456 × 20,456
4. Step 4: Simplify right side
   13,205x = 418,447,936
5. Step 5: Solve for x
   x = 418,447,936/13,205
6. Step 6: Final answer
   x = 31,688.60