Finding the Fourth Proportional to 1,443.14, 1,990.92 and 911.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.14 : 1,990.92 = 911.83 : x
2. Step 2: Convert to fraction form
   1,443.14/1,990.92 = 911.83/x
3. Step 3: Cross multiply
   1,443.14x = 1,990.92 × 911.83
4. Step 4: Simplify right side
   1,443.14x = 1,815,380.58
5. Step 5: Solve for x
   x = 1,815,380.58/1,443.14
6. Step 6: Final answer
   x = 1,257.94