Finding the Fourth Proportional to 2,191.78, 3,286.05 and 804.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.78 : 3,286.05 = 804.39 : x
2. Step 2: Convert to fraction form
   2,191.78/3,286.05 = 804.39/x
3. Step 3: Cross multiply
   2,191.78x = 3,286.05 × 804.39
4. Step 4: Simplify right side
   2,191.78x = 2,643,249.33
5. Step 5: Solve for x
   x = 2,643,249.33/2,191.78
6. Step 6: Final answer
   x = 1,205.98