Finding the Fourth Proportional to 2,115.69, 3,173.83 and 1,019.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.69 : 3,173.83 = 1,019.15 : x
2. Step 2: Convert to fraction form
   2,115.69/3,173.83 = 1,019.15/x
3. Step 3: Cross multiply
   2,115.69x = 3,173.83 × 1,019.15
4. Step 4: Simplify right side
   2,115.69x = 3,234,608.06
5. Step 5: Solve for x
   x = 3,234,608.06/2,115.69
6. Step 6: Final answer
   x = 1,528.87