Finding the Third Proportional to 199,648 and 428,504

Step by Step Solution

1. Step 1: Write the proportion equation
   199,648 : 428,504 = 428,504 : x
2. Step 2: Convert to fraction form
   199,648/428,504 = 428,504/x
3. Step 3: Cross multiply
   199,648x = 428,504 × 428,504
4. Step 4: Simplify right side
   199,648x = 183,615,678,016
5. Step 5: Solve for x
   x = 183,615,678,016/199,648
6. Step 6: Final answer
   x = 919,697.06