Finding the Fourth Proportional to 1,057.89, 1,587.30 and 441.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.89 : 1,587.30 = 441.72 : x
2. Step 2: Convert to fraction form
   1,057.89/1,587.30 = 441.72/x
3. Step 3: Cross multiply
   1,057.89x = 1,587.30 × 441.72
4. Step 4: Simplify right side
   1,057.89x = 701,142.16
5. Step 5: Solve for x
   x = 701,142.16/1,057.89
6. Step 6: Final answer
   x = 662.77