Finding the Fourth Proportional to 2,209.55, 3,314.73 and 911.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.55 : 3,314.73 = 911.93 : x
2. Step 2: Convert to fraction form
   2,209.55/3,314.73 = 911.93/x
3. Step 3: Cross multiply
   2,209.55x = 3,314.73 × 911.93
4. Step 4: Simplify right side
   2,209.55x = 3,022,801.73
5. Step 5: Solve for x
   x = 3,022,801.73/2,209.55
6. Step 6: Final answer
   x = 1,368.06