Finding the Third Proportional to 16,990 and 25,990

Step by Step Solution

1. Step 1: Write the proportion equation
   16,990 : 25,990 = 25,990 : x
2. Step 2: Convert to fraction form
   16,990/25,990 = 25,990/x
3. Step 3: Cross multiply
   16,990x = 25,990 × 25,990
4. Step 4: Simplify right side
   16,990x = 675,480,100
5. Step 5: Solve for x
   x = 675,480,100/16,990
6. Step 6: Final answer
   x = 39,757.51