Finding the Fourth Proportional to 1,989.40, 2,745.25 and 1,105.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.40 : 2,745.25 = 1,105.15 : x
2. Step 2: Convert to fraction form
   1,989.40/2,745.25 = 1,105.15/x
3. Step 3: Cross multiply
   1,989.40x = 2,745.25 × 1,105.15
4. Step 4: Simplify right side
   1,989.40x = 3,033,913.04
5. Step 5: Solve for x
   x = 3,033,913.04/1,989.40
6. Step 6: Final answer
   x = 1,525.04