Finding the Fourth Proportional to 2,217.45, 3,060.15 and 1,222.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.45 : 3,060.15 = 1,222.80 : x
2. Step 2: Convert to fraction form
   2,217.45/3,060.15 = 1,222.80/x
3. Step 3: Cross multiply
   2,217.45x = 3,060.15 × 1,222.80
4. Step 4: Simplify right side
   2,217.45x = 3,741,951.42
5. Step 5: Solve for x
   x = 3,741,951.42/2,217.45
6. Step 6: Final answer
   x = 1,687.50