Finding the Fourth Proportional to 3,679.99, 5,078.27 and 2,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,679.99 : 5,078.27 = 2,086.78 : x
2. Step 2: Convert to fraction form
   3,679.99/5,078.27 = 2,086.78/x
3. Step 3: Cross multiply
   3,679.99x = 5,078.27 × 2,086.78
4. Step 4: Simplify right side
   3,679.99x = 10,597,232.27
5. Step 5: Solve for x
   x = 10,597,232.27/3,679.99
6. Step 6: Final answer
   x = 2,879.69