Finding the Fourth Proportional to 2,218.48, 3,061.47 and 1,223.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.48 : 3,061.47 = 1,223.73 : x
2. Step 2: Convert to fraction form
   2,218.48/3,061.47 = 1,223.73/x
3. Step 3: Cross multiply
   2,218.48x = 3,061.47 × 1,223.73
4. Step 4: Simplify right side
   2,218.48x = 3,746,417.27
5. Step 5: Solve for x
   x = 3,746,417.27/2,218.48
6. Step 6: Final answer
   x = 1,688.73