Finding the Fourth Proportional to 3,620.88, 5,391.60 and 3,581.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.88 : 5,391.60 = 3,581.76 : x
2. Step 2: Convert to fraction form
   3,620.88/5,391.60 = 3,581.76/x
3. Step 3: Cross multiply
   3,620.88x = 5,391.60 × 3,581.76
4. Step 4: Simplify right side
   3,620.88x = 19,311,417.22
5. Step 5: Solve for x
   x = 19,311,417.22/3,620.88
6. Step 6: Final answer
   x = 5,333.35