Finding the Third Proportional to 8,145.56 and 13,116.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,145.56 : 13,116.09 = 13,116.09 : x
2. Step 2: Convert to fraction form
   8,145.56/13,116.09 = 13,116.09/x
3. Step 3: Cross multiply
   8,145.56x = 13,116.09 × 13,116.09
4. Step 4: Simplify right side
   8,145.56x = 172,031,915.26
5. Step 5: Solve for x
   x = 172,031,915.26/8,145.56
6. Step 6: Final answer
   x = 21,119.71