Finding the Third Proportional to 21,478 and 31,393

Step by Step Solution

1. Step 1: Write the proportion equation
   21,478 : 31,393 = 31,393 : x
2. Step 2: Convert to fraction form
   21,478/31,393 = 31,393/x
3. Step 3: Cross multiply
   21,478x = 31,393 × 31,393
4. Step 4: Simplify right side
   21,478x = 985,520,449
5. Step 5: Solve for x
   x = 985,520,449/21,478
6. Step 6: Final answer
   x = 45,885.11