Finding the Fourth Proportional to 2,405.56, 3,609.69 and 1,107.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.56 : 3,609.69 = 1,107.13 : x
2. Step 2: Convert to fraction form
   2,405.56/3,609.69 = 1,107.13/x
3. Step 3: Cross multiply
   2,405.56x = 3,609.69 × 1,107.13
4. Step 4: Simplify right side
   2,405.56x = 3,996,396.09
5. Step 5: Solve for x
   x = 3,996,396.09/2,405.56
6. Step 6: Final answer
   x = 1,661.32