Finding the Fourth Proportional to 799.82, 1,103.42 and 578.28

Step by Step Solution

1. Step 1: Write the proportion equation
   799.82 : 1,103.42 = 578.28 : x
2. Step 2: Convert to fraction form
   799.82/1,103.42 = 578.28/x
3. Step 3: Cross multiply
   799.82x = 1,103.42 × 578.28
4. Step 4: Simplify right side
   799.82x = 638,085.72
5. Step 5: Solve for x
   x = 638,085.72/799.82
6. Step 6: Final answer
   x = 797.79