Finding the Fourth Proportional to 2,217.87, 3,060.61 and 1,223.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.87 : 3,060.61 = 1,223.12 : x
2. Step 2: Convert to fraction form
   2,217.87/3,060.61 = 1,223.12/x
3. Step 3: Cross multiply
   2,217.87x = 3,060.61 × 1,223.12
4. Step 4: Simplify right side
   2,217.87x = 3,743,493.30
5. Step 5: Solve for x
   x = 3,743,493.30/2,217.87
6. Step 6: Final answer
   x = 1,687.88