Finding the Fourth Proportional to 3,709.81, 5,112.46 and 2,660.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,709.81 : 5,112.46 = 2,660.05 : x
2. Step 2: Convert to fraction form
   3,709.81/5,112.46 = 2,660.05/x
3. Step 3: Cross multiply
   3,709.81x = 5,112.46 × 2,660.05
4. Step 4: Simplify right side
   3,709.81x = 13,599,399.22
5. Step 5: Solve for x
   x = 13,599,399.22/3,709.81
6. Step 6: Final answer
   x = 3,665.79