Finding the Fourth Proportional to 3,960.79, 5,939.43 and 2,111.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,960.79 : 5,939.43 = 2,111.56 : x
2. Step 2: Convert to fraction form
   3,960.79/5,939.43 = 2,111.56/x
3. Step 3: Cross multiply
   3,960.79x = 5,939.43 × 2,111.56
4. Step 4: Simplify right side
   3,960.79x = 12,541,462.81
5. Step 5: Solve for x
   x = 12,541,462.81/3,960.79
6. Step 6: Final answer
   x = 3,166.40