Finding the Fourth Proportional to 1,028.98, 1,543.72 and 298.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028.98 : 1,543.72 = 298.55 : x
2. Step 2: Convert to fraction form
   1,028.98/1,543.72 = 298.55/x
3. Step 3: Cross multiply
   1,028.98x = 1,543.72 × 298.55
4. Step 4: Simplify right side
   1,028.98x = 460,877.61
5. Step 5: Solve for x
   x = 460,877.61/1,028.98
6. Step 6: Final answer
   x = 447.90