Finding the Fourth Proportional to 2,216.94, 3,059.34 and 1,222.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.94 : 3,059.34 = 1,222.20 : x
2. Step 2: Convert to fraction form
   2,216.94/3,059.34 = 1,222.20/x
3. Step 3: Cross multiply
   2,216.94x = 3,059.34 × 1,222.20
4. Step 4: Simplify right side
   2,216.94x = 3,739,125.35
5. Step 5: Solve for x
   x = 3,739,125.35/2,216.94
6. Step 6: Final answer
   x = 1,686.62