Finding the Fourth Proportional to 2,209.34, 3,314.55 and 911.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.34 : 3,314.55 = 911.18 : x
2. Step 2: Convert to fraction form
   2,209.34/3,314.55 = 911.18/x
3. Step 3: Cross multiply
   2,209.34x = 3,314.55 × 911.18
4. Step 4: Simplify right side
   2,209.34x = 3,020,151.67
5. Step 5: Solve for x
   x = 3,020,151.67/2,209.34
6. Step 6: Final answer
   x = 1,366.99