Finding the Fourth Proportional to 5,478.54, 8,217.72 and 3,719.18

Step by Step Solution

1. Step 1: Write the proportion equation
   5,478.54 : 8,217.72 = 3,719.18 : x
2. Step 2: Convert to fraction form
   5,478.54/8,217.72 = 3,719.18/x
3. Step 3: Cross multiply
   5,478.54x = 8,217.72 × 3,719.18
4. Step 4: Simplify right side
   5,478.54x = 30,563,179.87
5. Step 5: Solve for x
   x = 30,563,179.87/5,478.54
6. Step 6: Final answer
   x = 5,578.71