Finding the Fourth Proportional to 3,105.54, 4,283.28 and 2,111.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,105.54 : 4,283.28 = 2,111.67 : x
2. Step 2: Convert to fraction form
   3,105.54/4,283.28 = 2,111.67/x
3. Step 3: Cross multiply
   3,105.54x = 4,283.28 × 2,111.67
4. Step 4: Simplify right side
   3,105.54x = 9,044,873.88
5. Step 5: Solve for x
   x = 9,044,873.88/3,105.54
6. Step 6: Final answer
   x = 2,912.50