Finding the Fourth Proportional to 2,209.01, 3,311.69 and 911.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.01 : 3,311.69 = 911.39 : x
2. Step 2: Convert to fraction form
   2,209.01/3,311.69 = 911.39/x
3. Step 3: Cross multiply
   2,209.01x = 3,311.69 × 911.39
4. Step 4: Simplify right side
   2,209.01x = 3,018,220.03
5. Step 5: Solve for x
   x = 3,018,220.03/2,209.01
6. Step 6: Final answer
   x = 1,366.33