Finding the Fourth Proportional to 2,404.20, 3,318.78 and 2,155.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,404.20 : 3,318.78 = 2,155.08 : x
2. Step 2: Convert to fraction form
   2,404.20/3,318.78 = 2,155.08/x
3. Step 3: Cross multiply
   2,404.20x = 3,318.78 × 2,155.08
4. Step 4: Simplify right side
   2,404.20x = 7,152,236.40
5. Step 5: Solve for x
   x = 7,152,236.40/2,404.20
6. Step 6: Final answer
   x = 2,974.89