Finding the Fourth Proportional to 3,965.98, 5,951.28 and 3,661.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.98 : 5,951.28 = 3,661.51 : x
2. Step 2: Convert to fraction form
   3,965.98/5,951.28 = 3,661.51/x
3. Step 3: Cross multiply
   3,965.98x = 5,951.28 × 3,661.51
4. Step 4: Simplify right side
   3,965.98x = 21,790,671.23
5. Step 5: Solve for x
   x = 21,790,671.23/3,965.98
6. Step 6: Final answer
   x = 5,494.40