Finding the Fourth Proportional to 2,191.40, 3,287.55 and 804.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.40 : 3,287.55 = 804.68 : x
2. Step 2: Convert to fraction form
   2,191.40/3,287.55 = 804.68/x
3. Step 3: Cross multiply
   2,191.40x = 3,287.55 × 804.68
4. Step 4: Simplify right side
   2,191.40x = 2,645,405.27
5. Step 5: Solve for x
   x = 2,645,405.27/2,191.40
6. Step 6: Final answer
   x = 1,207.18