Finding the Third Proportional to 1,391,678 and 2,154,856

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391,678 : 2,154,856 = 2,154,856 : x
2. Step 2: Convert to fraction form
   1,391,678/2,154,856 = 2,154,856/x
3. Step 3: Cross multiply
   1,391,678x = 2,154,856 × 2,154,856
4. Step 4: Simplify right side
   1,391,678x = 4,643,404,380,736
5. Step 5: Solve for x
   x = 4,643,404,380,736/1,391,678
6. Step 6: Final answer
   x = 3,336,550.83