Finding the Third Proportional to 13,231 and 18,139

Step by Step Solution

1. Step 1: Write the proportion equation
   13,231 : 18,139 = 18,139 : x
2. Step 2: Convert to fraction form
   13,231/18,139 = 18,139/x
3. Step 3: Cross multiply
   13,231x = 18,139 × 18,139
4. Step 4: Simplify right side
   13,231x = 329,023,321
5. Step 5: Solve for x
   x = 329,023,321/13,231
6. Step 6: Final answer
   x = 24,867.61