Finding the Fourth Proportional to 630,842.72, 945,294.94 and 428,175.25

Step by Step Solution

1. Step 1: Write the proportion equation
   630,842.72 : 945,294.94 = 428,175.25 : x
2. Step 2: Convert to fraction form
   630,842.72/945,294.94 = 428,175.25/x
3. Step 3: Cross multiply
   630,842.72x = 945,294.94 × 428,175.25
4. Step 4: Simplify right side
   630,842.72x = 404,751,898,551.03
5. Step 5: Solve for x
   x = 404,751,898,551.03/630,842.72
6. Step 6: Final answer
   x = 641,605.09