Finding the Third Proportional to 13,980 and 21,871

Step by Step Solution

1. Step 1: Write the proportion equation
   13,980 : 21,871 = 21,871 : x
2. Step 2: Convert to fraction form
   13,980/21,871 = 21,871/x
3. Step 3: Cross multiply
   13,980x = 21,871 × 21,871
4. Step 4: Simplify right side
   13,980x = 478,340,641
5. Step 5: Solve for x
   x = 478,340,641/13,980
6. Step 6: Final answer
   x = 34,216.07