Finding the Fourth Proportional to 2,803.21, 4,205.27 and 855.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,803.21 : 4,205.27 = 855.25 : x
2. Step 2: Convert to fraction form
   2,803.21/4,205.27 = 855.25/x
3. Step 3: Cross multiply
   2,803.21x = 4,205.27 × 855.25
4. Step 4: Simplify right side
   2,803.21x = 3,596,552.89
5. Step 5: Solve for x
   x = 3,596,552.89/2,803.21
6. Step 6: Final answer
   x = 1,283.01