Finding the Third Proportional to 5,018.63 and 7,129.69

Step by Step Solution

1. Step 1: Write the proportion equation
   5,018.63 : 7,129.69 = 7,129.69 : x
2. Step 2: Convert to fraction form
   5,018.63/7,129.69 = 7,129.69/x
3. Step 3: Cross multiply
   5,018.63x = 7,129.69 × 7,129.69
4. Step 4: Simplify right side
   5,018.63x = 50,832,443.85
5. Step 5: Solve for x
   x = 50,832,443.85/5,018.63
6. Step 6: Final answer
   x = 10,128.76