Finding the Third Proportional to 13,431 and 20,443

Step by Step Solution

1. Step 1: Write the proportion equation
   13,431 : 20,443 = 20,443 : x
2. Step 2: Convert to fraction form
   13,431/20,443 = 20,443/x
3. Step 3: Cross multiply
   13,431x = 20,443 × 20,443
4. Step 4: Simplify right side
   13,431x = 417,916,249
5. Step 5: Solve for x
   x = 417,916,249/13,431
6. Step 6: Final answer
   x = 31,115.80