Finding the Third Proportional to 5,615,680 and 8,212,912

Step by Step Solution

1. Step 1: Write the proportion equation
   5,615,680 : 8,212,912 = 8,212,912 : x
2. Step 2: Convert to fraction form
   5,615,680/8,212,912 = 8,212,912/x
3. Step 3: Cross multiply
   5,615,680x = 8,212,912 × 8,212,912
4. Step 4: Simplify right side
   5,615,680x = 67,451,923,519,744
5. Step 5: Solve for x
   x = 67,451,923,519,744/5,615,680
6. Step 6: Final answer
   x = 12,011,354.55