Finding the Fourth Proportional to 3,551.50, 5,328.06 and 1,086.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,551.50 : 5,328.06 = 1,086.31 : x
2. Step 2: Convert to fraction form
   3,551.50/5,328.06 = 1,086.31/x
3. Step 3: Cross multiply
   3,551.50x = 5,328.06 × 1,086.31
4. Step 4: Simplify right side
   3,551.50x = 5,787,924.86
5. Step 5: Solve for x
   x = 5,787,924.86/3,551.50
6. Step 6: Final answer
   x = 1,629.71