Finding the Fourth Proportional to 2,217.21, 3,059.71 and 1,222.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.21 : 3,059.71 = 1,222.53 : x
2. Step 2: Convert to fraction form
   2,217.21/3,059.71 = 1,222.53/x
3. Step 3: Cross multiply
   2,217.21x = 3,059.71 × 1,222.53
4. Step 4: Simplify right side
   2,217.21x = 3,740,572.74
5. Step 5: Solve for x
   x = 3,740,572.74/2,217.21
6. Step 6: Final answer
   x = 1,687.07