Finding the Fourth Proportional to 2,187.18, 3,280.82 and 800.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.18 : 3,280.82 = 800.55 : x
2. Step 2: Convert to fraction form
   2,187.18/3,280.82 = 800.55/x
3. Step 3: Cross multiply
   2,187.18x = 3,280.82 × 800.55
4. Step 4: Simplify right side
   2,187.18x = 2,626,456.45
5. Step 5: Solve for x
   x = 2,626,456.45/2,187.18
6. Step 6: Final answer
   x = 1,200.84