Finding the Fourth Proportional to 2,216.89, 3,059.31 and 1,222.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.89 : 3,059.31 = 1,222.16 : x
2. Step 2: Convert to fraction form
   2,216.89/3,059.31 = 1,222.16/x
3. Step 3: Cross multiply
   2,216.89x = 3,059.31 × 1,222.16
4. Step 4: Simplify right side
   2,216.89x = 3,738,977.97
5. Step 5: Solve for x
   x = 3,738,977.97/2,216.89
6. Step 6: Final answer
   x = 1,686.59