Finding the Third Proportional to 13,991 and 21,839

Step by Step Solution

1. Step 1: Write the proportion equation
   13,991 : 21,839 = 21,839 : x
2. Step 2: Convert to fraction form
   13,991/21,839 = 21,839/x
3. Step 3: Cross multiply
   13,991x = 21,839 × 21,839
4. Step 4: Simplify right side
   13,991x = 476,941,921
5. Step 5: Solve for x
   x = 476,941,921/13,991
6. Step 6: Final answer
   x = 34,089.19