Finding the Third Proportional to 20,385 and 42,039

Step by Step Solution

1. Step 1: Write the proportion equation
   20,385 : 42,039 = 42,039 : x
2. Step 2: Convert to fraction form
   20,385/42,039 = 42,039/x
3. Step 3: Cross multiply
   20,385x = 42,039 × 42,039
4. Step 4: Simplify right side
   20,385x = 1,767,277,521
5. Step 5: Solve for x
   x = 1,767,277,521/20,385
6. Step 6: Final answer
   x = 86,695.00