Finding the Fourth Proportional to 1,989.42, 2,745.34 and 1,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.42 : 2,745.34 = 1,105.20 : x
2. Step 2: Convert to fraction form
   1,989.42/2,745.34 = 1,105.20/x
3. Step 3: Cross multiply
   1,989.42x = 2,745.34 × 1,105.20
4. Step 4: Simplify right side
   1,989.42x = 3,034,149.77
5. Step 5: Solve for x
   x = 3,034,149.77/1,989.42
6. Step 6: Final answer
   x = 1,525.14