Finding the Fourth Proportional to 2,218.46, 3,061.47 and 1,223.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.46 : 3,061.47 = 1,223.74 : x
2. Step 2: Convert to fraction form
   2,218.46/3,061.47 = 1,223.74/x
3. Step 3: Cross multiply
   2,218.46x = 3,061.47 × 1,223.74
4. Step 4: Simplify right side
   2,218.46x = 3,746,427.61
5. Step 5: Solve for x
   x = 3,746,427.61/2,218.46
6. Step 6: Final answer
   x = 1,688.76