Finding the Third Proportional to 7,145.72 and 10,665.42

Step by Step Solution

1. Step 1: Write the proportion equation
   7,145.72 : 10,665.42 = 10,665.42 : x
2. Step 2: Convert to fraction form
   7,145.72/10,665.42 = 10,665.42/x
3. Step 3: Cross multiply
   7,145.72x = 10,665.42 × 10,665.42
4. Step 4: Simplify right side
   7,145.72x = 113,751,223.77
5. Step 5: Solve for x
   x = 113,751,223.77/7,145.72
6. Step 6: Final answer
   x = 15,918.79