Finding the Fourth Proportional to 2,218.29, 3,061.25 and 1,223.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.29 : 3,061.25 = 1,223.55 : x
2. Step 2: Convert to fraction form
   2,218.29/3,061.25 = 1,223.55/x
3. Step 3: Cross multiply
   2,218.29x = 3,061.25 × 1,223.55
4. Step 4: Simplify right side
   2,218.29x = 3,745,602.39
5. Step 5: Solve for x
   x = 3,745,602.39/2,218.29
6. Step 6: Final answer
   x = 1,688.51