Finding the Fourth Proportional to 3,679.80, 5,076.83 and 2,086.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,679.80 : 5,076.83 = 2,086.21 : x
2. Step 2: Convert to fraction form
   3,679.80/5,076.83 = 2,086.21/x
3. Step 3: Cross multiply
   3,679.80x = 5,076.83 × 2,086.21
4. Step 4: Simplify right side
   3,679.80x = 10,591,328.30
5. Step 5: Solve for x
   x = 10,591,328.30/3,679.80
6. Step 6: Final answer
   x = 2,878.24