Finding the Fourth Proportional to 5,621.91, 8,418.49 and 5,455.62

Step by Step Solution

1. Step 1: Write the proportion equation
   5,621.91 : 8,418.49 = 5,455.62 : x
2. Step 2: Convert to fraction form
   5,621.91/8,418.49 = 5,455.62/x
3. Step 3: Cross multiply
   5,621.91x = 8,418.49 × 5,455.62
4. Step 4: Simplify right side
   5,621.91x = 45,928,082.41
5. Step 5: Solve for x
   x = 45,928,082.41/5,621.91
6. Step 6: Final answer
   x = 8,169.48