Finding the Fourth Proportional to 2,016.39, 3,019.41 and 1,321.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.39 : 3,019.41 = 1,321.01 : x
2. Step 2: Convert to fraction form
   2,016.39/3,019.41 = 1,321.01/x
3. Step 3: Cross multiply
   2,016.39x = 3,019.41 × 1,321.01
4. Step 4: Simplify right side
   2,016.39x = 3,988,667.03
5. Step 5: Solve for x
   x = 3,988,667.03/2,016.39
6. Step 6: Final answer
   x = 1,978.12