Finding the Third Proportional to 1,405,840 and 2,178,746

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405,840 : 2,178,746 = 2,178,746 : x
2. Step 2: Convert to fraction form
   1,405,840/2,178,746 = 2,178,746/x
3. Step 3: Cross multiply
   1,405,840x = 2,178,746 × 2,178,746
4. Step 4: Simplify right side
   1,405,840x = 4,746,934,132,516
5. Step 5: Solve for x
   x = 4,746,934,132,516/1,405,840
6. Step 6: Final answer
   x = 3,376,582.07