Finding the Fourth Proportional to 639,558.89, 959,839.52 and 446,175.69

Step by Step Solution

1. Step 1: Write the proportion equation
   639,558.89 : 959,839.52 = 446,175.69 : x
2. Step 2: Convert to fraction form
   639,558.89/959,839.52 = 446,175.69/x
3. Step 3: Cross multiply
   639,558.89x = 959,839.52 × 446,175.69
4. Step 4: Simplify right side
   639,558.89x = 428,257,062,203.83
5. Step 5: Solve for x
   x = 428,257,062,203.83/639,558.89
6. Step 6: Final answer
   x = 669,613.18