Finding the Fourth Proportional to 2,115.82, 2,919.96 and 1,171.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.82 : 2,919.96 = 1,171.62 : x
2. Step 2: Convert to fraction form
   2,115.82/2,919.96 = 1,171.62/x
3. Step 3: Cross multiply
   2,115.82x = 2,919.96 × 1,171.62
4. Step 4: Simplify right side
   2,115.82x = 3,421,083.54
5. Step 5: Solve for x
   x = 3,421,083.54/2,115.82
6. Step 6: Final answer
   x = 1,616.91