Finding the Fourth Proportional to 2,218.62, 3,061.83 and 1,223.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.62 : 3,061.83 = 1,223.89 : x
2. Step 2: Convert to fraction form
   2,218.62/3,061.83 = 1,223.89/x
3. Step 3: Cross multiply
   2,218.62x = 3,061.83 × 1,223.89
4. Step 4: Simplify right side
   2,218.62x = 3,747,343.12
5. Step 5: Solve for x
   x = 3,747,343.12/2,218.62
6. Step 6: Final answer
   x = 1,689.04