Finding the Fourth Proportional to 3,879.72, 5,356.69 and 3,631.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879.72 : 5,356.69 = 3,631.86 : x
2. Step 2: Convert to fraction form
   3,879.72/5,356.69 = 3,631.86/x
3. Step 3: Cross multiply
   3,879.72x = 5,356.69 × 3,631.86
4. Step 4: Simplify right side
   3,879.72x = 19,454,739.06
5. Step 5: Solve for x
   x = 19,454,739.06/3,879.72
6. Step 6: Final answer
   x = 5,014.47