Finding the Fourth Proportional to 2,209.39, 3,311.56 and 909.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.39 : 3,311.56 = 909.25 : x
2. Step 2: Convert to fraction form
   2,209.39/3,311.56 = 909.25/x
3. Step 3: Cross multiply
   2,209.39x = 3,311.56 × 909.25
4. Step 4: Simplify right side
   2,209.39x = 3,011,035.93
5. Step 5: Solve for x
   x = 3,011,035.93/2,209.39
6. Step 6: Final answer
   x = 1,362.84