Finding the Fourth Proportional to 1,442.35, 1,989.92 and 911.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.35 : 1,989.92 = 911.27 : x
2. Step 2: Convert to fraction form
   1,442.35/1,989.92 = 911.27/x
3. Step 3: Cross multiply
   1,442.35x = 1,989.92 × 911.27
4. Step 4: Simplify right side
   1,442.35x = 1,813,339.89
5. Step 5: Solve for x
   x = 1,813,339.89/1,442.35
6. Step 6: Final answer
   x = 1,257.22