Finding the Third Proportional to 678,423 and 1,054,980

Step by Step Solution

1. Step 1: Write the proportion equation
   678,423 : 1,054,980 = 1,054,980 : x
2. Step 2: Convert to fraction form
   678,423/1,054,980 = 1,054,980/x
3. Step 3: Cross multiply
   678,423x = 1,054,980 × 1,054,980
4. Step 4: Simplify right side
   678,423x = 1,112,982,800,400
5. Step 5: Solve for x
   x = 1,112,982,800,400/678,423
6. Step 6: Final answer
   x = 1,640,544.03