Finding the Fourth Proportional to 2,315.92, 3,196.08 and 1,321.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,315.92 : 3,196.08 = 1,321.28 : x
2. Step 2: Convert to fraction form
   2,315.92/3,196.08 = 1,321.28/x
3. Step 3: Cross multiply
   2,315.92x = 3,196.08 × 1,321.28
4. Step 4: Simplify right side
   2,315.92x = 4,222,916.58
5. Step 5: Solve for x
   x = 4,222,916.58/2,315.92
6. Step 6: Final answer
   x = 1,823.43