Finding the Fourth Proportional to 2,900.36, 4,002.96 and 2,155.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,900.36 : 4,002.96 = 2,155.16 : x
2. Step 2: Convert to fraction form
   2,900.36/4,002.96 = 2,155.16/x
3. Step 3: Cross multiply
   2,900.36x = 4,002.96 × 2,155.16
4. Step 4: Simplify right side
   2,900.36x = 8,627,019.27
5. Step 5: Solve for x
   x = 8,627,019.27/2,900.36
6. Step 6: Final answer
   x = 2,974.46