Finding the Fourth Proportional to 3,619.25, 5,429.42 and 1,311.29

Step by Step Solution

1. Step 1: Write the proportion equation
   3,619.25 : 5,429.42 = 1,311.29 : x
2. Step 2: Convert to fraction form
   3,619.25/5,429.42 = 1,311.29/x
3. Step 3: Cross multiply
   3,619.25x = 5,429.42 × 1,311.29
4. Step 4: Simplify right side
   3,619.25x = 7,119,544.15
5. Step 5: Solve for x
   x = 7,119,544.15/3,619.25
6. Step 6: Final answer
   x = 1,967.13