Finding the Fourth Proportional to 2,218.15, 3,061.05 and 1,223.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.15 : 3,061.05 = 1,223.42 : x
2. Step 2: Convert to fraction form
   2,218.15/3,061.05 = 1,223.42/x
3. Step 3: Cross multiply
   2,218.15x = 3,061.05 × 1,223.42
4. Step 4: Simplify right side
   2,218.15x = 3,744,957.34
5. Step 5: Solve for x
   x = 3,744,957.34/2,218.15
6. Step 6: Final answer
   x = 1,688.32