Finding the Fourth Proportional to 2,991.69, 4,488.18 and 911.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.69 : 4,488.18 = 911.64 : x
2. Step 2: Convert to fraction form
   2,991.69/4,488.18 = 911.64/x
3. Step 3: Cross multiply
   2,991.69x = 4,488.18 × 911.64
4. Step 4: Simplify right side
   2,991.69x = 4,091,585.88
5. Step 5: Solve for x
   x = 4,091,585.88/2,991.69
6. Step 6: Final answer
   x = 1,367.65