Finding the Third Proportional to 21,208 and 31,799

Step by Step Solution

1. Step 1: Write the proportion equation
   21,208 : 31,799 = 31,799 : x
2. Step 2: Convert to fraction form
   21,208/31,799 = 31,799/x
3. Step 3: Cross multiply
   21,208x = 31,799 × 31,799
4. Step 4: Simplify right side
   21,208x = 1,011,176,401
5. Step 5: Solve for x
   x = 1,011,176,401/21,208
6. Step 6: Final answer
   x = 47,679.01