Finding the Fourth Proportional to 2,217.17, 3,059.61 and 1,222.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.17 : 3,059.61 = 1,222.31 : x
2. Step 2: Convert to fraction form
   2,217.17/3,059.61 = 1,222.31/x
3. Step 3: Cross multiply
   2,217.17x = 3,059.61 × 1,222.31
4. Step 4: Simplify right side
   2,217.17x = 3,739,791.90
5. Step 5: Solve for x
   x = 3,739,791.90/2,217.17
6. Step 6: Final answer
   x = 1,686.74