Finding the Fourth Proportional to 2,115.50, 2,919.29 and 1,171.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.50 : 2,919.29 = 1,171.22 : x
2. Step 2: Convert to fraction form
   2,115.50/2,919.29 = 1,171.22/x
3. Step 3: Cross multiply
   2,115.50x = 2,919.29 × 1,171.22
4. Step 4: Simplify right side
   2,115.50x = 3,419,110.38
5. Step 5: Solve for x
   x = 3,419,110.38/2,115.50
6. Step 6: Final answer
   x = 1,616.22