Finding the Fourth Proportional to 3,388.08, 5,078.43 and 2,156.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,388.08 : 5,078.43 = 2,156.04 : x
2. Step 2: Convert to fraction form
   3,388.08/5,078.43 = 2,156.04/x
3. Step 3: Cross multiply
   3,388.08x = 5,078.43 × 2,156.04
4. Step 4: Simplify right side
   3,388.08x = 10,949,298.22
5. Step 5: Solve for x
   x = 10,949,298.22/3,388.08
6. Step 6: Final answer
   x = 3,231.71