Finding the Third Proportional to 9,915 and 13,505

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915 : 13,505 = 13,505 : x
2. Step 2: Convert to fraction form
   9,915/13,505 = 13,505/x
3. Step 3: Cross multiply
   9,915x = 13,505 × 13,505
4. Step 4: Simplify right side
   9,915x = 182,385,025
5. Step 5: Solve for x
   x = 182,385,025/9,915
6. Step 6: Final answer
   x = 18,394.86