Finding the Fourth Proportional to 2,099.49, 2,897.82 and 1,215.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.49 : 2,897.82 = 1,215.87 : x
2. Step 2: Convert to fraction form
   2,099.49/2,897.82 = 1,215.87/x
3. Step 3: Cross multiply
   2,099.49x = 2,897.82 × 1,215.87
4. Step 4: Simplify right side
   2,099.49x = 3,523,372.40
5. Step 5: Solve for x
   x = 3,523,372.40/2,099.49
6. Step 6: Final answer
   x = 1,678.20