Finding the Fourth Proportional to 2,218.42, 3,061.45 and 1,223.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.42 : 3,061.45 = 1,223.74 : x
2. Step 2: Convert to fraction form
   2,218.42/3,061.45 = 1,223.74/x
3. Step 3: Cross multiply
   2,218.42x = 3,061.45 × 1,223.74
4. Step 4: Simplify right side
   2,218.42x = 3,746,418.82
5. Step 5: Solve for x
   x = 3,746,418.82/2,218.42
6. Step 6: Final answer
   x = 1,688.78