Finding the Third Proportional to 10,431 and 13,959

Step by Step Solution

1. Step 1: Write the proportion equation
   10,431 : 13,959 = 13,959 : x
2. Step 2: Convert to fraction form
   10,431/13,959 = 13,959/x
3. Step 3: Cross multiply
   10,431x = 13,959 × 13,959
4. Step 4: Simplify right side
   10,431x = 194,853,681
5. Step 5: Solve for x
   x = 194,853,681/10,431
6. Step 6: Final answer
   x = 18,680.25