Finding the Third Proportional to 5,615,640 and 8,212,858

Step by Step Solution

1. Step 1: Write the proportion equation
   5,615,640 : 8,212,858 = 8,212,858 : x
2. Step 2: Convert to fraction form
   5,615,640/8,212,858 = 8,212,858/x
3. Step 3: Cross multiply
   5,615,640x = 8,212,858 × 8,212,858
4. Step 4: Simplify right side
   5,615,640x = 67,451,036,528,164
5. Step 5: Solve for x
   x = 67,451,036,528,164/5,615,640
6. Step 6: Final answer
   x = 12,011,282.16