Finding the Third Proportional to 199,809 and 428,049

Step by Step Solution

1. Step 1: Write the proportion equation
   199,809 : 428,049 = 428,049 : x
2. Step 2: Convert to fraction form
   199,809/428,049 = 428,049/x
3. Step 3: Cross multiply
   199,809x = 428,049 × 428,049
4. Step 4: Simplify right side
   199,809x = 183,225,946,401
5. Step 5: Solve for x
   x = 183,225,946,401/199,809
6. Step 6: Final answer
   x = 917,005.47