Finding the Third Proportional to 5,086,456 and 7,129,712

Step by Step Solution

1. Step 1: Write the proportion equation
   5,086,456 : 7,129,712 = 7,129,712 : x
2. Step 2: Convert to fraction form
   5,086,456/7,129,712 = 7,129,712/x
3. Step 3: Cross multiply
   5,086,456x = 7,129,712 × 7,129,712
4. Step 4: Simplify right side
   5,086,456x = 50,832,793,202,944
5. Step 5: Solve for x
   x = 50,832,793,202,944/5,086,456
6. Step 6: Final answer
   x = 9,993,754.63