Finding the Fourth Proportional to 1,989.55, 2,745.63 and 1,105.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.55 : 2,745.63 = 1,105.40 : x
2. Step 2: Convert to fraction form
   1,989.55/2,745.63 = 1,105.40/x
3. Step 3: Cross multiply
   1,989.55x = 2,745.63 × 1,105.40
4. Step 4: Simplify right side
   1,989.55x = 3,035,026.27
5. Step 5: Solve for x
   x = 3,035,026.27/1,989.55
6. Step 6: Final answer
   x = 1,525.48