Finding the Third Proportional to 20,218 and 42,530

Step by Step Solution

1. Step 1: Write the proportion equation
   20,218 : 42,530 = 42,530 : x
2. Step 2: Convert to fraction form
   20,218/42,530 = 42,530/x
3. Step 3: Cross multiply
   20,218x = 42,530 × 42,530
4. Step 4: Simplify right side
   20,218x = 1,808,800,900
5. Step 5: Solve for x
   x = 1,808,800,900/20,218
6. Step 6: Final answer
   x = 89,464.88