Finding the Third Proportional to 5,128,584 and 8,120,981

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,584 : 8,120,981 = 8,120,981 : x
2. Step 2: Convert to fraction form
   5,128,584/8,120,981 = 8,120,981/x
3. Step 3: Cross multiply
   5,128,584x = 8,120,981 × 8,120,981
4. Step 4: Simplify right side
   5,128,584x = 65,950,332,402,361
5. Step 5: Solve for x
   x = 65,950,332,402,361/5,128,584
6. Step 6: Final answer
   x = 12,859,364.77