Finding the Fourth Proportional to 2,616.69, 3,923.79 and 1,521.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.69 : 3,923.79 = 1,521.36 : x
2. Step 2: Convert to fraction form
   2,616.69/3,923.79 = 1,521.36/x
3. Step 3: Cross multiply
   2,616.69x = 3,923.79 × 1,521.36
4. Step 4: Simplify right side
   2,616.69x = 5,969,497.15
5. Step 5: Solve for x
   x = 5,969,497.15/2,616.69
6. Step 6: Final answer
   x = 2,281.32