Finding the Third Proportional to 9,987 and 13,162.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,987 : 13,162.50 = 13,162.50 : x
2. Step 2: Convert to fraction form
   9,987/13,162.50 = 13,162.50/x
3. Step 3: Cross multiply
   9,987x = 13,162.50 × 13,162.50
4. Step 4: Simplify right side
   9,987x = 173,251,406.25
5. Step 5: Solve for x
   x = 173,251,406.25/9,987
6. Step 6: Final answer
   x = 17,347.69