Finding the Third Proportional to 21,218 and 31,171

Step by Step Solution

1. Step 1: Write the proportion equation
   21,218 : 31,171 = 31,171 : x
2. Step 2: Convert to fraction form
   21,218/31,171 = 31,171/x
3. Step 3: Cross multiply
   21,218x = 31,171 × 31,171
4. Step 4: Simplify right side
   21,218x = 971,631,241
5. Step 5: Solve for x
   x = 971,631,241/21,218
6. Step 6: Final answer
   x = 45,792.78