Finding the Third Proportional to 21,399 and 43,986

Step by Step Solution

1. Step 1: Write the proportion equation
   21,399 : 43,986 = 43,986 : x
2. Step 2: Convert to fraction form
   21,399/43,986 = 43,986/x
3. Step 3: Cross multiply
   21,399x = 43,986 × 43,986
4. Step 4: Simplify right side
   21,399x = 1,934,768,196
5. Step 5: Solve for x
   x = 1,934,768,196/21,399
6. Step 6: Final answer
   x = 90,413.95