Finding the Fourth Proportional to 1,989.72, 2,745.83 and 1,105.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.72 : 2,745.83 = 1,105.61 : x
2. Step 2: Convert to fraction form
   1,989.72/2,745.83 = 1,105.61/x
3. Step 3: Cross multiply
   1,989.72x = 2,745.83 × 1,105.61
4. Step 4: Simplify right side
   1,989.72x = 3,035,817.11
5. Step 5: Solve for x
   x = 3,035,817.11/1,989.72
6. Step 6: Final answer
   x = 1,525.75