Finding the Fourth Proportional to 3,917.79, 5,867.37 and 2,160.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,917.79 : 5,867.37 = 2,160.09 : x
2. Step 2: Convert to fraction form
   3,917.79/5,867.37 = 2,160.09/x
3. Step 3: Cross multiply
   3,917.79x = 5,867.37 × 2,160.09
4. Step 4: Simplify right side
   3,917.79x = 12,674,047.26
5. Step 5: Solve for x
   x = 12,674,047.26/3,917.79
6. Step 6: Final answer
   x = 3,235.00