Finding the Fourth Proportional to 2,099.45, 2,896.88 and 1,215.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.45 : 2,896.88 = 1,215.10 : x
2. Step 2: Convert to fraction form
   2,099.45/2,896.88 = 1,215.10/x
3. Step 3: Cross multiply
   2,099.45x = 2,896.88 × 1,215.10
4. Step 4: Simplify right side
   2,099.45x = 3,519,984.40
5. Step 5: Solve for x
   x = 3,519,984.40/2,099.45
6. Step 6: Final answer
   x = 1,676.63