Finding the Fourth Proportional to 2,218.22, 3,061.14 and 1,223.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.22 : 3,061.14 = 1,223.56 : x
2. Step 2: Convert to fraction form
   2,218.22/3,061.14 = 1,223.56/x
3. Step 3: Cross multiply
   2,218.22x = 3,061.14 × 1,223.56
4. Step 4: Simplify right side
   2,218.22x = 3,745,482.34
5. Step 5: Solve for x
   x = 3,745,482.34/2,218.22
6. Step 6: Final answer
   x = 1,688.51