Finding the Third Proportional to 20,385 and 42,081

Step by Step Solution

1. Step 1: Write the proportion equation
   20,385 : 42,081 = 42,081 : x
2. Step 2: Convert to fraction form
   20,385/42,081 = 42,081/x
3. Step 3: Cross multiply
   20,385x = 42,081 × 42,081
4. Step 4: Simplify right side
   20,385x = 1,770,810,561
5. Step 5: Solve for x
   x = 1,770,810,561/20,385
6. Step 6: Final answer
   x = 86,868.31