Finding the Fourth Proportional to 1,989.34, 2,745.20 and 1,105.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.34 : 2,745.20 = 1,105.12 : x
2. Step 2: Convert to fraction form
   1,989.34/2,745.20 = 1,105.12/x
3. Step 3: Cross multiply
   1,989.34x = 2,745.20 × 1,105.12
4. Step 4: Simplify right side
   1,989.34x = 3,033,775.42
5. Step 5: Solve for x
   x = 3,033,775.42/1,989.34
6. Step 6: Final answer
   x = 1,525.02