Finding the Third Proportional to 21,039 and 31,613

Step by Step Solution

1. Step 1: Write the proportion equation
   21,039 : 31,613 = 31,613 : x
2. Step 2: Convert to fraction form
   21,039/31,613 = 31,613/x
3. Step 3: Cross multiply
   21,039x = 31,613 × 31,613
4. Step 4: Simplify right side
   21,039x = 999,381,769
5. Step 5: Solve for x
   x = 999,381,769/21,039
6. Step 6: Final answer
   x = 47,501.39