Finding the Fourth Proportional to 2,405.56, 3,609.30 and 1,019.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.56 : 3,609.30 = 1,019.20 : x
2. Step 2: Convert to fraction form
   2,405.56/3,609.30 = 1,019.20/x
3. Step 3: Cross multiply
   2,405.56x = 3,609.30 × 1,019.20
4. Step 4: Simplify right side
   2,405.56x = 3,678,598.56
5. Step 5: Solve for x
   x = 3,678,598.56/2,405.56
6. Step 6: Final answer
   x = 1,529.21