Finding the Third Proportional to 5,086,512 and 7,128,738

Step by Step Solution

1. Step 1: Write the proportion equation
   5,086,512 : 7,128,738 = 7,128,738 : x
2. Step 2: Convert to fraction form
   5,086,512/7,128,738 = 7,128,738/x
3. Step 3: Cross multiply
   5,086,512x = 7,128,738 × 7,128,738
4. Step 4: Simplify right side
   5,086,512x = 50,818,905,472,644
5. Step 5: Solve for x
   x = 50,818,905,472,644/5,086,512
6. Step 6: Final answer
   x = 9,990,914.30