Finding the Fourth Proportional to 2,280.39, 3,420.27 and 819.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.39 : 3,420.27 = 819.33 : x
2. Step 2: Convert to fraction form
   2,280.39/3,420.27 = 819.33/x
3. Step 3: Cross multiply
   2,280.39x = 3,420.27 × 819.33
4. Step 4: Simplify right side
   2,280.39x = 2,802,329.82
5. Step 5: Solve for x
   x = 2,802,329.82/2,280.39
6. Step 6: Final answer
   x = 1,228.88