Finding the Fourth Proportional to 1,078.74, 1,617.81 and 298.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.74 : 1,617.81 = 298.55 : x
2. Step 2: Convert to fraction form
   1,078.74/1,617.81 = 298.55/x
3. Step 3: Cross multiply
   1,078.74x = 1,617.81 × 298.55
4. Step 4: Simplify right side
   1,078.74x = 483,001.78
5. Step 5: Solve for x
   x = 483,001.78/1,078.74
6. Step 6: Final answer
   x = 447.75