Finding the Fourth Proportional to 2,217.34, 3,059.79 and 1,222.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.34 : 3,059.79 = 1,222.63 : x
2. Step 2: Convert to fraction form
   2,217.34/3,059.79 = 1,222.63/x
3. Step 3: Cross multiply
   2,217.34x = 3,059.79 × 1,222.63
4. Step 4: Simplify right side
   2,217.34x = 3,740,997.73
5. Step 5: Solve for x
   x = 3,740,997.73/2,217.34
6. Step 6: Final answer
   x = 1,687.15