Finding the Fourth Proportional to 1,280.44, 1,919.72 and 549.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.44 : 1,919.72 = 549.56 : x
2. Step 2: Convert to fraction form
   1,280.44/1,919.72 = 549.56/x
3. Step 3: Cross multiply
   1,280.44x = 1,919.72 × 549.56
4. Step 4: Simplify right side
   1,280.44x = 1,055,001.32
5. Step 5: Solve for x
   x = 1,055,001.32/1,280.44
6. Step 6: Final answer
   x = 823.94