Finding the Third Proportional to 21,356 and 31,211

Step by Step Solution

1. Step 1: Write the proportion equation
   21,356 : 31,211 = 31,211 : x
2. Step 2: Convert to fraction form
   21,356/31,211 = 31,211/x
3. Step 3: Cross multiply
   21,356x = 31,211 × 31,211
4. Step 4: Simplify right side
   21,356x = 974,126,521
5. Step 5: Solve for x
   x = 974,126,521/21,356
6. Step 6: Final answer
   x = 45,613.72