Finding the Fourth Proportional to 3,402.56, 5,105.73 and 2,660.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,402.56 : 5,105.73 = 2,660.06 : x
2. Step 2: Convert to fraction form
   3,402.56/5,105.73 = 2,660.06/x
3. Step 3: Cross multiply
   3,402.56x = 5,105.73 × 2,660.06
4. Step 4: Simplify right side
   3,402.56x = 13,581,522.62
5. Step 5: Solve for x
   x = 13,581,522.62/3,402.56
6. Step 6: Final answer
   x = 3,991.57