Finding the Fourth Proportional to 2,218.43, 3,061.39 and 1,223.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.43 : 3,061.39 = 1,223.71 : x
2. Step 2: Convert to fraction form
   2,218.43/3,061.39 = 1,223.71/x
3. Step 3: Cross multiply
   2,218.43x = 3,061.39 × 1,223.71
4. Step 4: Simplify right side
   2,218.43x = 3,746,253.56
5. Step 5: Solve for x
   x = 3,746,253.56/2,218.43
6. Step 6: Final answer
   x = 1,688.70