Finding the Third Proportional to 13,110.19 and 15,661.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,110.19 : 15,661.69 = 15,661.69 : x
2. Step 2: Convert to fraction form
   13,110.19/15,661.69 = 15,661.69/x
3. Step 3: Cross multiply
   13,110.19x = 15,661.69 × 15,661.69
4. Step 4: Simplify right side
   13,110.19x = 245,288,455.35
5. Step 5: Solve for x
   x = 245,288,455.35/13,110.19
6. Step 6: Final answer
   x = 18,709.76