Finding the Fourth Proportional to 2,218.47, 3,061.48 and 1,223.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.47 : 3,061.48 = 1,223.81 : x
2. Step 2: Convert to fraction form
   2,218.47/3,061.48 = 1,223.81/x
3. Step 3: Cross multiply
   2,218.47x = 3,061.48 × 1,223.81
4. Step 4: Simplify right side
   2,218.47x = 3,746,669.84
5. Step 5: Solve for x
   x = 3,746,669.84/2,218.47
6. Step 6: Final answer
   x = 1,688.85