Finding the Fourth Proportional to 3,621.17, 5,399.33 and 3,555.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,621.17 : 5,399.33 = 3,555.56 : x
2. Step 2: Convert to fraction form
   3,621.17/5,399.33 = 3,555.56/x
3. Step 3: Cross multiply
   3,621.17x = 5,399.33 × 3,555.56
4. Step 4: Simplify right side
   3,621.17x = 19,197,637.50
5. Step 5: Solve for x
   x = 19,197,637.50/3,621.17
6. Step 6: Final answer
   x = 5,301.50