Finding the Fourth Proportional to 2,218.54, 3,061.59 and 1,223.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.54 : 3,061.59 = 1,223.80 : x
2. Step 2: Convert to fraction form
   2,218.54/3,061.59 = 1,223.80/x
3. Step 3: Cross multiply
   2,218.54x = 3,061.59 × 1,223.80
4. Step 4: Simplify right side
   2,218.54x = 3,746,773.84
5. Step 5: Solve for x
   x = 3,746,773.84/2,218.54
6. Step 6: Final answer
   x = 1,688.85