Finding the Fourth Proportional to 3,859.78, 5,789.24 and 1,086.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.78 : 5,789.24 = 1,086.56 : x
2. Step 2: Convert to fraction form
   3,859.78/5,789.24 = 1,086.56/x
3. Step 3: Cross multiply
   3,859.78x = 5,789.24 × 1,086.56
4. Step 4: Simplify right side
   3,859.78x = 6,290,356.61
5. Step 5: Solve for x
   x = 6,290,356.61/3,859.78
6. Step 6: Final answer
   x = 1,629.72