Finding the Fourth Proportional to 2,209.38, 3,312.81 and 909.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.38 : 3,312.81 = 909.33 : x
2. Step 2: Convert to fraction form
   2,209.38/3,312.81 = 909.33/x
3. Step 3: Cross multiply
   2,209.38x = 3,312.81 × 909.33
4. Step 4: Simplify right side
   2,209.38x = 3,012,437.52
5. Step 5: Solve for x
   x = 3,012,437.52/2,209.38
6. Step 6: Final answer
   x = 1,363.48