Finding the Third Proportional to 199,808 and 428,045

Step by Step Solution

1. Step 1: Write the proportion equation
   199,808 : 428,045 = 428,045 : x
2. Step 2: Convert to fraction form
   199,808/428,045 = 428,045/x
3. Step 3: Cross multiply
   199,808x = 428,045 × 428,045
4. Step 4: Simplify right side
   199,808x = 183,222,522,025
5. Step 5: Solve for x
   x = 183,222,522,025/199,808
6. Step 6: Final answer
   x = 916,992.92