Finding the Fourth Proportional to 3,856.37, 5,321.77 and 2,087.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.37 : 5,321.77 = 2,087.98 : x
2. Step 2: Convert to fraction form
   3,856.37/5,321.77 = 2,087.98/x
3. Step 3: Cross multiply
   3,856.37x = 5,321.77 × 2,087.98
4. Step 4: Simplify right side
   3,856.37x = 11,111,730.80
5. Step 5: Solve for x
   x = 11,111,730.80/3,856.37
6. Step 6: Final answer
   x = 2,881.40