Finding the Fourth Proportional to 1,989.71, 2,745.55 and 1,105.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.71 : 2,745.55 = 1,105.39 : x
2. Step 2: Convert to fraction form
   1,989.71/2,745.55 = 1,105.39/x
3. Step 3: Cross multiply
   1,989.71x = 2,745.55 × 1,105.39
4. Step 4: Simplify right side
   1,989.71x = 3,034,903.51
5. Step 5: Solve for x
   x = 3,034,903.51/1,989.71
6. Step 6: Final answer
   x = 1,525.30