Finding the Third Proportional to 21,122 and 31,620

Step by Step Solution

1. Step 1: Write the proportion equation
   21,122 : 31,620 = 31,620 : x
2. Step 2: Convert to fraction form
   21,122/31,620 = 31,620/x
3. Step 3: Cross multiply
   21,122x = 31,620 × 31,620
4. Step 4: Simplify right side
   21,122x = 999,824,400
5. Step 5: Solve for x
   x = 999,824,400/21,122
6. Step 6: Final answer
   x = 47,335.69