Finding the Third Proportional to 1,405,836 and 2,178,738

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405,836 : 2,178,738 = 2,178,738 : x
2. Step 2: Convert to fraction form
   1,405,836/2,178,738 = 2,178,738/x
3. Step 3: Cross multiply
   1,405,836x = 2,178,738 × 2,178,738
4. Step 4: Simplify right side
   1,405,836x = 4,746,899,272,644
5. Step 5: Solve for x
   x = 4,746,899,272,644/1,405,836
6. Step 6: Final answer
   x = 3,376,566.88