Finding the Fourth Proportional to 1,028.61, 1,543.52 and 443.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028.61 : 1,543.52 = 443.56 : x
2. Step 2: Convert to fraction form
   1,028.61/1,543.52 = 443.56/x
3. Step 3: Cross multiply
   1,028.61x = 1,543.52 × 443.56
4. Step 4: Simplify right side
   1,028.61x = 684,643.73
5. Step 5: Solve for x
   x = 684,643.73/1,028.61
6. Step 6: Final answer
   x = 665.60