Finding the Third Proportional to 3,997.69 and 7,129.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,997.69 : 7,129.69 = 7,129.69 : x
2. Step 2: Convert to fraction form
   3,997.69/7,129.69 = 7,129.69/x
3. Step 3: Cross multiply
   3,997.69x = 7,129.69 × 7,129.69
4. Step 4: Simplify right side
   3,997.69x = 50,832,443.85
5. Step 5: Solve for x
   x = 50,832,443.85/3,997.69
6. Step 6: Final answer
   x = 12,715.46