Finding the Fourth Proportional to 3,789.67, 5,229.69 and 2,111.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,789.67 : 5,229.69 = 2,111.20 : x
2. Step 2: Convert to fraction form
   3,789.67/5,229.69 = 2,111.20/x
3. Step 3: Cross multiply
   3,789.67x = 5,229.69 × 2,111.20
4. Step 4: Simplify right side
   3,789.67x = 11,040,921.53
5. Step 5: Solve for x
   x = 11,040,921.53/3,789.67
6. Step 6: Final answer
   x = 2,913.43