Finding the Third Proportional to 20,559 and 42,739

Step by Step Solution

1. Step 1: Write the proportion equation
   20,559 : 42,739 = 42,739 : x
2. Step 2: Convert to fraction form
   20,559/42,739 = 42,739/x
3. Step 3: Cross multiply
   20,559x = 42,739 × 42,739
4. Step 4: Simplify right side
   20,559x = 1,826,622,121
5. Step 5: Solve for x
   x = 1,826,622,121/20,559
6. Step 6: Final answer
   x = 88,847.81