Finding the Fourth Proportional to 1,989.78, 2,745.88 and 1,150.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.78 : 2,745.88 = 1,150.50 : x
2. Step 2: Convert to fraction form
   1,989.78/2,745.88 = 1,150.50/x
3. Step 3: Cross multiply
   1,989.78x = 2,745.88 × 1,150.50
4. Step 4: Simplify right side
   1,989.78x = 3,159,134.94
5. Step 5: Solve for x
   x = 3,159,134.94/1,989.78
6. Step 6: Final answer
   x = 1,587.68