Finding the Fourth Proportional to 1,989.48, 2,745.39 and 1,105.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.48 : 2,745.39 = 1,105.28 : x
2. Step 2: Convert to fraction form
   1,989.48/2,745.39 = 1,105.28/x
3. Step 3: Cross multiply
   1,989.48x = 2,745.39 × 1,105.28
4. Step 4: Simplify right side
   1,989.48x = 3,034,410.93
5. Step 5: Solve for x
   x = 3,034,410.93/1,989.48
6. Step 6: Final answer
   x = 1,525.23