Finding the Fourth Proportional to 2,217.78, 3,060.56 and 1,223.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.78 : 3,060.56 = 1,223.05 : x
2. Step 2: Convert to fraction form
   2,217.78/3,060.56 = 1,223.05/x
3. Step 3: Cross multiply
   2,217.78x = 3,060.56 × 1,223.05
4. Step 4: Simplify right side
   2,217.78x = 3,743,215.61
5. Step 5: Solve for x
   x = 3,743,215.61/2,217.78
6. Step 6: Final answer
   x = 1,687.82