Finding the Fourth Proportional to 2,217.35, 3,059.81 and 1,222.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.35 : 3,059.81 = 1,222.64 : x
2. Step 2: Convert to fraction form
   2,217.35/3,059.81 = 1,222.64/x
3. Step 3: Cross multiply
   2,217.35x = 3,059.81 × 1,222.64
4. Step 4: Simplify right side
   2,217.35x = 3,741,046.10
5. Step 5: Solve for x
   x = 3,741,046.10/2,217.35
6. Step 6: Final answer
   x = 1,687.17