Finding the Fourth Proportional to 3,608.82, 5,411.61 and 2,128.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,608.82 : 5,411.61 = 2,128.82 : x
2. Step 2: Convert to fraction form
   3,608.82/5,411.61 = 2,128.82/x
3. Step 3: Cross multiply
   3,608.82x = 5,411.61 × 2,128.82
4. Step 4: Simplify right side
   3,608.82x = 11,520,316.54
5. Step 5: Solve for x
   x = 11,520,316.54/3,608.82
6. Step 6: Final answer
   x = 3,192.27