Finding the Third Proportional to 1,405,856 and 2,178,768

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405,856 : 2,178,768 = 2,178,768 : x
2. Step 2: Convert to fraction form
   1,405,856/2,178,768 = 2,178,768/x
3. Step 3: Cross multiply
   1,405,856x = 2,178,768 × 2,178,768
4. Step 4: Simplify right side
   1,405,856x = 4,747,029,997,824
5. Step 5: Solve for x
   x = 4,747,029,997,824/1,405,856
6. Step 6: Final answer
   x = 3,376,611.83