Finding the Fourth Proportional to 2,218.80, 3,061.59 and 1,223.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.80 : 3,061.59 = 1,223.94 : x
2. Step 2: Convert to fraction form
   2,218.80/3,061.59 = 1,223.94/x
3. Step 3: Cross multiply
   2,218.80x = 3,061.59 × 1,223.94
4. Step 4: Simplify right side
   2,218.80x = 3,747,202.46
5. Step 5: Solve for x
   x = 3,747,202.46/2,218.80
6. Step 6: Final answer
   x = 1,688.84