Finding the Third Proportional to 20,429 and 41,679

Step by Step Solution

1. Step 1: Write the proportion equation
   20,429 : 41,679 = 41,679 : x
2. Step 2: Convert to fraction form
   20,429/41,679 = 41,679/x
3. Step 3: Cross multiply
   20,429x = 41,679 × 41,679
4. Step 4: Simplify right side
   20,429x = 1,737,139,041
5. Step 5: Solve for x
   x = 1,737,139,041/20,429
6. Step 6: Final answer
   x = 85,032.99