Finding the Third Proportional to 20,385 and 42,985

Step by Step Solution

1. Step 1: Write the proportion equation
   20,385 : 42,985 = 42,985 : x
2. Step 2: Convert to fraction form
   20,385/42,985 = 42,985/x
3. Step 3: Cross multiply
   20,385x = 42,985 × 42,985
4. Step 4: Simplify right side
   20,385x = 1,847,710,225
5. Step 5: Solve for x
   x = 1,847,710,225/20,385
6. Step 6: Final answer
   x = 90,640.68