Finding the Fourth Proportional to 2,007.57, 3,012.12 and 911.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.57 : 3,012.12 = 911.19 : x
2. Step 2: Convert to fraction form
   2,007.57/3,012.12 = 911.19/x
3. Step 3: Cross multiply
   2,007.57x = 3,012.12 × 911.19
4. Step 4: Simplify right side
   2,007.57x = 2,744,613.62
5. Step 5: Solve for x
   x = 2,744,613.62/2,007.57
6. Step 6: Final answer
   x = 1,367.13