Finding the Fourth Proportional to 3,985.39, 5,499.75 and 2,216.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.39 : 5,499.75 = 2,216.88 : x
2. Step 2: Convert to fraction form
   3,985.39/5,499.75 = 2,216.88/x
3. Step 3: Cross multiply
   3,985.39x = 5,499.75 × 2,216.88
4. Step 4: Simplify right side
   3,985.39x = 12,192,285.78
5. Step 5: Solve for x
   x = 12,192,285.78/3,985.39
6. Step 6: Final answer
   x = 3,059.25