Finding the Fourth Proportional to 3,551.78, 5,327.37 and 1,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,551.78 : 5,327.37 = 1,086.72 : x
2. Step 2: Convert to fraction form
   3,551.78/5,327.37 = 1,086.72/x
3. Step 3: Cross multiply
   3,551.78x = 5,327.37 × 1,086.72
4. Step 4: Simplify right side
   3,551.78x = 5,789,339.55
5. Step 5: Solve for x
   x = 5,789,339.55/3,551.78
6. Step 6: Final answer
   x = 1,629.98