Finding the Fourth Proportional to 3,985.54, 5,499.72 and 2,217.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.54 : 5,499.72 = 2,217.16 : x
2. Step 2: Convert to fraction form
   3,985.54/5,499.72 = 2,217.16/x
3. Step 3: Cross multiply
   3,985.54x = 5,499.72 × 2,217.16
4. Step 4: Simplify right side
   3,985.54x = 12,193,759.20
5. Step 5: Solve for x
   x = 12,193,759.20/3,985.54
6. Step 6: Final answer
   x = 3,059.50