Finding the Fourth Proportional to 2,099.40, 2,896.92 and 1,215.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.40 : 2,896.92 = 1,215.12 : x
2. Step 2: Convert to fraction form
   2,099.40/2,896.92 = 1,215.12/x
3. Step 3: Cross multiply
   2,099.40x = 2,896.92 × 1,215.12
4. Step 4: Simplify right side
   2,099.40x = 3,520,105.43
5. Step 5: Solve for x
   x = 3,520,105.43/2,099.40
6. Step 6: Final answer
   x = 1,676.72