Finding the Fourth Proportional to 2,217.49, 3,060.12 and 1,222.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.49 : 3,060.12 = 1,222.78 : x
2. Step 2: Convert to fraction form
   2,217.49/3,060.12 = 1,222.78/x
3. Step 3: Cross multiply
   2,217.49x = 3,060.12 × 1,222.78
4. Step 4: Simplify right side
   2,217.49x = 3,741,843.59
5. Step 5: Solve for x
   x = 3,741,843.59/2,217.49
6. Step 6: Final answer
   x = 1,687.42