Finding the Fourth Proportional to 3,704.20, 5,111.85 and 2,111.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,704.20 : 5,111.85 = 2,111.20 : x
2. Step 2: Convert to fraction form
   3,704.20/5,111.85 = 2,111.20/x
3. Step 3: Cross multiply
   3,704.20x = 5,111.85 × 2,111.20
4. Step 4: Simplify right side
   3,704.20x = 10,792,137.72
5. Step 5: Solve for x
   x = 10,792,137.72/3,704.20
6. Step 6: Final answer
   x = 2,913.49