Finding the Fourth Proportional to 1,989.93, 2,745.78 and 1,105.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.93 : 2,745.78 = 1,105.71 : x
2. Step 2: Convert to fraction form
   1,989.93/2,745.78 = 1,105.71/x
3. Step 3: Cross multiply
   1,989.93x = 2,745.78 × 1,105.71
4. Step 4: Simplify right side
   1,989.93x = 3,036,036.40
5. Step 5: Solve for x
   x = 3,036,036.40/1,989.93
6. Step 6: Final answer
   x = 1,525.70