Finding the Fourth Proportional to 3,727.69, 5,144.21 and 2,155.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,727.69 : 5,144.21 = 2,155.78 : x
2. Step 2: Convert to fraction form
   3,727.69/5,144.21 = 2,155.78/x
3. Step 3: Cross multiply
   3,727.69x = 5,144.21 × 2,155.78
4. Step 4: Simplify right side
   3,727.69x = 11,089,788.77
5. Step 5: Solve for x
   x = 11,089,788.77/3,727.69
6. Step 6: Final answer
   x = 2,974.98