Finding the Fourth Proportional to 2,099.59, 2,897.20 and 1,215.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.59 : 2,897.20 = 1,215.22 : x
2. Step 2: Convert to fraction form
   2,099.59/2,897.20 = 1,215.22/x
3. Step 3: Cross multiply
   2,099.59x = 2,897.20 × 1,215.22
4. Step 4: Simplify right side
   2,099.59x = 3,520,735.38
5. Step 5: Solve for x
   x = 3,520,735.38/2,099.59
6. Step 6: Final answer
   x = 1,676.87