Finding the Third Proportional to 5,520,780 and 8,380,476

Step by Step Solution

1. Step 1: Write the proportion equation
   5,520,780 : 8,380,476 = 8,380,476 : x
2. Step 2: Convert to fraction form
   5,520,780/8,380,476 = 8,380,476/x
3. Step 3: Cross multiply
   5,520,780x = 8,380,476 × 8,380,476
4. Step 4: Simplify right side
   5,520,780x = 70,232,377,986,576
5. Step 5: Solve for x
   x = 70,232,377,986,576/5,520,780
6. Step 6: Final answer
   x = 12,721,459.28