Finding the Fourth Proportional to 3,903.69, 5,390.71 and 2,508.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,903.69 : 5,390.71 = 2,508.89 : x
2. Step 2: Convert to fraction form
   3,903.69/5,390.71 = 2,508.89/x
3. Step 3: Cross multiply
   3,903.69x = 5,390.71 × 2,508.89
4. Step 4: Simplify right side
   3,903.69x = 13,524,685.87
5. Step 5: Solve for x
   x = 13,524,685.87/3,903.69
6. Step 6: Final answer
   x = 3,464.59