Finding the Fourth Proportional to 3,855.89, 5,321.17 and 2,087.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.89 : 5,321.17 = 2,087.54 : x
2. Step 2: Convert to fraction form
   3,855.89/5,321.17 = 2,087.54/x
3. Step 3: Cross multiply
   3,855.89x = 5,321.17 × 2,087.54
4. Step 4: Simplify right side
   3,855.89x = 11,108,123.40
5. Step 5: Solve for x
   x = 11,108,123.40/3,855.89
6. Step 6: Final answer
   x = 2,880.82