Finding the Fourth Proportional to 3,968.76, 5,441.40 and 3,898.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968.76 : 5,441.40 = 3,898.56 : x
2. Step 2: Convert to fraction form
   3,968.76/5,441.40 = 3,898.56/x
3. Step 3: Cross multiply
   3,968.76x = 5,441.40 × 3,898.56
4. Step 4: Simplify right side
   3,968.76x = 21,213,624.38
5. Step 5: Solve for x
   x = 21,213,624.38/3,968.76
6. Step 6: Final answer
   x = 5,345.15