Finding the Fourth Proportional to 1,989.30, 2,745.20 and 1,105.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.30 : 2,745.20 = 1,105.10 : x
2. Step 2: Convert to fraction form
   1,989.30/2,745.20 = 1,105.10/x
3. Step 3: Cross multiply
   1,989.30x = 2,745.20 × 1,105.10
4. Step 4: Simplify right side
   1,989.30x = 3,033,701.27
5. Step 5: Solve for x
   x = 3,033,701.27/1,989.30
6. Step 6: Final answer
   x = 1,525.01