Finding the Fourth Proportional to 2,217.78, 3,060.69 and 1,223.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.78 : 3,060.69 = 1,223.16 : x
2. Step 2: Convert to fraction form
   2,217.78/3,060.69 = 1,223.16/x
3. Step 3: Cross multiply
   2,217.78x = 3,060.69 × 1,223.16
4. Step 4: Simplify right side
   2,217.78x = 3,743,713.58
5. Step 5: Solve for x
   x = 3,743,713.58/2,217.78
6. Step 6: Final answer
   x = 1,688.05