Finding the Third Proportional to 20,554 and 42,078

Step by Step Solution

1. Step 1: Write the proportion equation
   20,554 : 42,078 = 42,078 : x
2. Step 2: Convert to fraction form
   20,554/42,078 = 42,078/x
3. Step 3: Cross multiply
   20,554x = 42,078 × 42,078
4. Step 4: Simplify right side
   20,554x = 1,770,558,084
5. Step 5: Solve for x
   x = 1,770,558,084/20,554
6. Step 6: Final answer
   x = 86,141.78