Finding the Fourth Proportional to 3,671.28, 5,512.37 and 3,616.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,671.28 : 5,512.37 = 3,616.61 : x
2. Step 2: Convert to fraction form
   3,671.28/5,512.37 = 3,616.61/x
3. Step 3: Cross multiply
   3,671.28x = 5,512.37 × 3,616.61
4. Step 4: Simplify right side
   3,671.28x = 19,936,046.82
5. Step 5: Solve for x
   x = 19,936,046.82/3,671.28
6. Step 6: Final answer
   x = 5,430.27