Finding the Fourth Proportional to 1,442.62, 1,990.27 and 911.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.62 : 1,990.27 = 911.35 : x
2. Step 2: Convert to fraction form
   1,442.62/1,990.27 = 911.35/x
3. Step 3: Cross multiply
   1,442.62x = 1,990.27 × 911.35
4. Step 4: Simplify right side
   1,442.62x = 1,813,832.56
5. Step 5: Solve for x
   x = 1,813,832.56/1,442.62
6. Step 6: Final answer
   x = 1,257.32