Finding the Third Proportional to 388,991 and 804,980

Step by Step Solution

1. Step 1: Write the proportion equation
   388,991 : 804,980 = 804,980 : x
2. Step 2: Convert to fraction form
   388,991/804,980 = 804,980/x
3. Step 3: Cross multiply
   388,991x = 804,980 × 804,980
4. Step 4: Simplify right side
   388,991x = 647,992,800,400
5. Step 5: Solve for x
   x = 647,992,800,400/388,991
6. Step 6: Final answer
   x = 1,665,829.80