Finding the Fourth Proportional to 2,608.05, 3,902.35 and 2,578.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.05 : 3,902.35 = 2,578.89 : x
2. Step 2: Convert to fraction form
   2,608.05/3,902.35 = 2,578.89/x
3. Step 3: Cross multiply
   2,608.05x = 3,902.35 × 2,578.89
4. Step 4: Simplify right side
   2,608.05x = 10,063,731.39
5. Step 5: Solve for x
   x = 10,063,731.39/2,608.05
6. Step 6: Final answer
   x = 3,858.72