Finding the Fourth Proportional to 2,099.15, 2,896.59 and 1,215.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.15 : 2,896.59 = 1,215.23 : x
2. Step 2: Convert to fraction form
   2,099.15/2,896.59 = 1,215.23/x
3. Step 3: Cross multiply
   2,099.15x = 2,896.59 × 1,215.23
4. Step 4: Simplify right side
   2,099.15x = 3,520,023.07
5. Step 5: Solve for x
   x = 3,520,023.07/2,099.15
6. Step 6: Final answer
   x = 1,676.88