Finding the Fourth Proportional to 2,218.59, 3,061.73 and 1,223.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.59 : 3,061.73 = 1,223.98 : x
2. Step 2: Convert to fraction form
   2,218.59/3,061.73 = 1,223.98/x
3. Step 3: Cross multiply
   2,218.59x = 3,061.73 × 1,223.98
4. Step 4: Simplify right side
   2,218.59x = 3,747,491.69
5. Step 5: Solve for x
   x = 3,747,491.69/2,218.59
6. Step 6: Final answer
   x = 1,689.13