Finding the Third Proportional to 20,658 and 42,405

Step by Step Solution

1. Step 1: Write the proportion equation
   20,658 : 42,405 = 42,405 : x
2. Step 2: Convert to fraction form
   20,658/42,405 = 42,405/x
3. Step 3: Cross multiply
   20,658x = 42,405 × 42,405
4. Step 4: Simplify right side
   20,658x = 1,798,184,025
5. Step 5: Solve for x
   x = 1,798,184,025/20,658
6. Step 6: Final answer
   x = 87,045.41