Finding the Fourth Proportional to 2,099.71, 3,148.41 and 866.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.71 : 3,148.41 = 866.84 : x
2. Step 2: Convert to fraction form
   2,099.71/3,148.41 = 866.84/x
3. Step 3: Cross multiply
   2,099.71x = 3,148.41 × 866.84
4. Step 4: Simplify right side
   2,099.71x = 2,729,167.72
5. Step 5: Solve for x
   x = 2,729,167.72/2,099.71
6. Step 6: Final answer
   x = 1,299.78