Finding the Fourth Proportional to 2,216.88, 3,059.19 and 1,222.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.88 : 3,059.19 = 1,222.20 : x
2. Step 2: Convert to fraction form
   2,216.88/3,059.19 = 1,222.20/x
3. Step 3: Cross multiply
   2,216.88x = 3,059.19 × 1,222.20
4. Step 4: Simplify right side
   2,216.88x = 3,738,942.02
5. Step 5: Solve for x
   x = 3,738,942.02/2,216.88
6. Step 6: Final answer
   x = 1,686.58