Finding the Fourth Proportional to 2,218.29, 3,061.19 and 1,223.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.29 : 3,061.19 = 1,223.51 : x
2. Step 2: Convert to fraction form
   2,218.29/3,061.19 = 1,223.51/x
3. Step 3: Cross multiply
   2,218.29x = 3,061.19 × 1,223.51
4. Step 4: Simplify right side
   2,218.29x = 3,745,384.33
5. Step 5: Solve for x
   x = 3,745,384.33/2,218.29
6. Step 6: Final answer
   x = 1,688.41