Finding the Third Proportional to 5,451,869 and 8,405,231

Step by Step Solution

1. Step 1: Write the proportion equation
   5,451,869 : 8,405,231 = 8,405,231 : x
2. Step 2: Convert to fraction form
   5,451,869/8,405,231 = 8,405,231/x
3. Step 3: Cross multiply
   5,451,869x = 8,405,231 × 8,405,231
4. Step 4: Simplify right side
   5,451,869x = 70,647,908,163,361
5. Step 5: Solve for x
   x = 70,647,908,163,361/5,451,869
6. Step 6: Final answer
   x = 12,958,475.00