Finding the Third Proportional to 20,389 and 42,992

Step by Step Solution

1. Step 1: Write the proportion equation
   20,389 : 42,992 = 42,992 : x
2. Step 2: Convert to fraction form
   20,389/42,992 = 42,992/x
3. Step 3: Cross multiply
   20,389x = 42,992 × 42,992
4. Step 4: Simplify right side
   20,389x = 1,848,312,064
5. Step 5: Solve for x
   x = 1,848,312,064/20,389
6. Step 6: Final answer
   x = 90,652.41