Finding the Third Proportional to 9,699 and 12,910.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,699 : 12,910.50 = 12,910.50 : x
2. Step 2: Convert to fraction form
   9,699/12,910.50 = 12,910.50/x
3. Step 3: Cross multiply
   9,699x = 12,910.50 × 12,910.50
4. Step 4: Simplify right side
   9,699x = 166,681,010.25
5. Step 5: Solve for x
   x = 166,681,010.25/9,699
6. Step 6: Final answer
   x = 17,185.38