Finding the Fourth Proportional to 1,323.57, 1,986.56 and 1,105.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,323.57 : 1,986.56 = 1,105.55 : x
2. Step 2: Convert to fraction form
   1,323.57/1,986.56 = 1,105.55/x
3. Step 3: Cross multiply
   1,323.57x = 1,986.56 × 1,105.55
4. Step 4: Simplify right side
   1,323.57x = 2,196,237.54
5. Step 5: Solve for x
   x = 2,196,237.54/1,323.57
6. Step 6: Final answer
   x = 1,659.32