Finding the Fourth Proportional to 2,217.40, 3,059.85 and 1,222.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.40 : 3,059.85 = 1,222.65 : x
2. Step 2: Convert to fraction form
   2,217.40/3,059.85 = 1,222.65/x
3. Step 3: Cross multiply
   2,217.40x = 3,059.85 × 1,222.65
4. Step 4: Simplify right side
   2,217.40x = 3,741,139.55
5. Step 5: Solve for x
   x = 3,741,139.55/2,217.40
6. Step 6: Final answer
   x = 1,687.18