Finding the Third Proportional to 5,086,630 and 7,128,895

Step by Step Solution

1. Step 1: Write the proportion equation
   5,086,630 : 7,128,895 = 7,128,895 : x
2. Step 2: Convert to fraction form
   5,086,630/7,128,895 = 7,128,895/x
3. Step 3: Cross multiply
   5,086,630x = 7,128,895 × 7,128,895
4. Step 4: Simplify right side
   5,086,630x = 50,821,143,921,025
5. Step 5: Solve for x
   x = 50,821,143,921,025/5,086,630
6. Step 6: Final answer
   x = 9,991,122.59