Finding the Third Proportional to 9,139.50 and 18,997.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.50 : 18,997.31 = 18,997.31 : x
2. Step 2: Convert to fraction form
   9,139.50/18,997.31 = 18,997.31/x
3. Step 3: Cross multiply
   9,139.50x = 18,997.31 × 18,997.31
4. Step 4: Simplify right side
   9,139.50x = 360,897,882.22
5. Step 5: Solve for x
   x = 360,897,882.22/9,139.50
6. Step 6: Final answer
   x = 39,487.71