Finding the Fourth Proportional to 2,778.21, 4,167.59 and 803.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.21 : 4,167.59 = 803.96 : x
2. Step 2: Convert to fraction form
   2,778.21/4,167.59 = 803.96/x
3. Step 3: Cross multiply
   2,778.21x = 4,167.59 × 803.96
4. Step 4: Simplify right side
   2,778.21x = 3,350,550.80
5. Step 5: Solve for x
   x = 3,350,550.80/2,778.21
6. Step 6: Final answer
   x = 1,206.01