Finding the Third Proportional to 20,790 and 42,806

Step by Step Solution

1. Step 1: Write the proportion equation
   20,790 : 42,806 = 42,806 : x
2. Step 2: Convert to fraction form
   20,790/42,806 = 42,806/x
3. Step 3: Cross multiply
   20,790x = 42,806 × 42,806
4. Step 4: Simplify right side
   20,790x = 1,832,353,636
5. Step 5: Solve for x
   x = 1,832,353,636/20,790
6. Step 6: Final answer
   x = 88,136.30