Finding the Fourth Proportional to 2,218.17, 3,061.06 and 1,223.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.17 : 3,061.06 = 1,223.49 : x
2. Step 2: Convert to fraction form
   2,218.17/3,061.06 = 1,223.49/x
3. Step 3: Cross multiply
   2,218.17x = 3,061.06 × 1,223.49
4. Step 4: Simplify right side
   2,218.17x = 3,745,173.24
5. Step 5: Solve for x
   x = 3,745,173.24/2,218.17
6. Step 6: Final answer
   x = 1,688.41