Finding the Fourth Proportional to 3,608.91, 5,404.73 and 2,780.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,608.91 : 5,404.73 = 2,780.28 : x
2. Step 2: Convert to fraction form
   3,608.91/5,404.73 = 2,780.28/x
3. Step 3: Cross multiply
   3,608.91x = 5,404.73 × 2,780.28
4. Step 4: Simplify right side
   3,608.91x = 15,026,648.82
5. Step 5: Solve for x
   x = 15,026,648.82/3,608.91
6. Step 6: Final answer
   x = 4,163.76