Finding the Third Proportional to 20,109 and 42,889

Step by Step Solution

1. Step 1: Write the proportion equation
   20,109 : 42,889 = 42,889 : x
2. Step 2: Convert to fraction form
   20,109/42,889 = 42,889/x
3. Step 3: Cross multiply
   20,109x = 42,889 × 42,889
4. Step 4: Simplify right side
   20,109x = 1,839,466,321
5. Step 5: Solve for x
   x = 1,839,466,321/20,109
6. Step 6: Final answer
   x = 91,474.78