Finding the Fourth Proportional to 2,218.53, 3,061.67 and 1,223.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.53 : 3,061.67 = 1,223.94 : x
2. Step 2: Convert to fraction form
   2,218.53/3,061.67 = 1,223.94/x
3. Step 3: Cross multiply
   2,218.53x = 3,061.67 × 1,223.94
4. Step 4: Simplify right side
   2,218.53x = 3,747,294.26
5. Step 5: Solve for x
   x = 3,747,294.26/2,218.53
6. Step 6: Final answer
   x = 1,689.09