Finding the Fourth Proportional to 3,978.72, 5,961.25 and 3,631.53

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.72 : 5,961.25 = 3,631.53 : x
2. Step 2: Convert to fraction form
   3,978.72/5,961.25 = 3,631.53/x
3. Step 3: Cross multiply
   3,978.72x = 5,961.25 × 3,631.53
4. Step 4: Simplify right side
   3,978.72x = 21,648,464.68
5. Step 5: Solve for x
   x = 21,648,464.68/3,978.72
6. Step 6: Final answer
   x = 5,441.06