Finding the Fourth Proportional to 2,217.33, 3,059.86 and 1,222.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.33 : 3,059.86 = 1,222.61 : x
2. Step 2: Convert to fraction form
   2,217.33/3,059.86 = 1,222.61/x
3. Step 3: Cross multiply
   2,217.33x = 3,059.86 × 1,222.61
4. Step 4: Simplify right side
   2,217.33x = 3,741,020.03
5. Step 5: Solve for x
   x = 3,741,020.03/2,217.33
6. Step 6: Final answer
   x = 1,687.17