Finding the Fourth Proportional to 2,185.92, 3,016.44 and 1,215.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.92 : 3,016.44 = 1,215.72 : x
2. Step 2: Convert to fraction form
   2,185.92/3,016.44 = 1,215.72/x
3. Step 3: Cross multiply
   2,185.92x = 3,016.44 × 1,215.72
4. Step 4: Simplify right side
   2,185.92x = 3,667,146.44
5. Step 5: Solve for x
   x = 3,667,146.44/2,185.92
6. Step 6: Final answer
   x = 1,677.62