Finding the Fourth Proportional to 1,989.58, 2,745.49 and 1,243.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.58 : 2,745.49 = 1,243.50 : x
2. Step 2: Convert to fraction form
   1,989.58/2,745.49 = 1,243.50/x
3. Step 3: Cross multiply
   1,989.58x = 2,745.49 × 1,243.50
4. Step 4: Simplify right side
   1,989.58x = 3,414,016.82
5. Step 5: Solve for x
   x = 3,414,016.82/1,989.58
6. Step 6: Final answer
   x = 1,715.95