Finding the Fourth Proportional to 3,727.42, 5,144.31 and 2,155.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,727.42 : 5,144.31 = 2,155.21 : x
2. Step 2: Convert to fraction form
   3,727.42/5,144.31 = 2,155.21/x
3. Step 3: Cross multiply
   3,727.42x = 5,144.31 × 2,155.21
4. Step 4: Simplify right side
   3,727.42x = 11,087,055.49
5. Step 5: Solve for x
   x = 11,087,055.49/3,727.42
6. Step 6: Final answer
   x = 2,974.46