Finding the Fourth Proportional to 2,099.34, 2,896.90 and 1,215.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.34 : 2,896.90 = 1,215.20 : x
2. Step 2: Convert to fraction form
   2,099.34/2,896.90 = 1,215.20/x
3. Step 3: Cross multiply
   2,099.34x = 2,896.90 × 1,215.20
4. Step 4: Simplify right side
   2,099.34x = 3,520,298.40
5. Step 5: Solve for x
   x = 3,520,298.40/2,099.34
6. Step 6: Final answer
   x = 1,676.86