Finding the Third Proportional to 199,856 and 428,048

Step by Step Solution

1. Step 1: Write the proportion equation
   199,856 : 428,048 = 428,048 : x
2. Step 2: Convert to fraction form
   199,856/428,048 = 428,048/x
3. Step 3: Cross multiply
   199,856x = 428,048 × 428,048
4. Step 4: Simplify right side
   199,856x = 183,225,090,304
5. Step 5: Solve for x
   x = 183,225,090,304/199,856
6. Step 6: Final answer
   x = 916,785.54