Finding the Third Proportional to 678,818 and 1,340,500

Step by Step Solution

1. Step 1: Write the proportion equation
   678,818 : 1,340,500 = 1,340,500 : x
2. Step 2: Convert to fraction form
   678,818/1,340,500 = 1,340,500/x
3. Step 3: Cross multiply
   678,818x = 1,340,500 × 1,340,500
4. Step 4: Simplify right side
   678,818x = 1,796,940,250,000
5. Step 5: Solve for x
   x = 1,796,940,250,000/678,818
6. Step 6: Final answer
   x = 2,647,160.58