Finding the Third Proportional to 21,420.28 and 31,398.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,420.28 : 31,398.47 = 31,398.47 : x
2. Step 2: Convert to fraction form
   21,420.28/31,398.47 = 31,398.47/x
3. Step 3: Cross multiply
   21,420.28x = 31,398.47 × 31,398.47
4. Step 4: Simplify right side
   21,420.28x = 985,863,839.84
5. Step 5: Solve for x
   x = 985,863,839.84/21,420.28
6. Step 6: Final answer
   x = 46,024.79