Finding the Fourth Proportional to 2,288.18, 3,438.12 and 2,155.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.18 : 3,438.12 = 2,155.39 : x
2. Step 2: Convert to fraction form
   2,288.18/3,438.12 = 2,155.39/x
3. Step 3: Cross multiply
   2,288.18x = 3,438.12 × 2,155.39
4. Step 4: Simplify right side
   2,288.18x = 7,410,472.28
5. Step 5: Solve for x
   x = 7,410,472.28/2,288.18
6. Step 6: Final answer
   x = 3,238.59