Finding the Fourth Proportional to 628,072.72, 941,752.20 and 428,634.72

Step by Step Solution

1. Step 1: Write the proportion equation
   628,072.72 : 941,752.20 = 428,634.72 : x
2. Step 2: Convert to fraction form
   628,072.72/941,752.20 = 428,634.72/x
3. Step 3: Cross multiply
   628,072.72x = 941,752.20 × 428,634.72
4. Step 4: Simplify right side
   628,072.72x = 403,667,690,556.38
5. Step 5: Solve for x
   x = 403,667,690,556.38/628,072.72
6. Step 6: Final answer
   x = 642,708.52