Finding the Fourth Proportional to 3,984.48, 5,424.84 and 3,972.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984.48 : 5,424.84 = 3,972.12 : x
2. Step 2: Convert to fraction form
   3,984.48/5,424.84 = 3,972.12/x
3. Step 3: Cross multiply
   3,984.48x = 5,424.84 × 3,972.12
4. Step 4: Simplify right side
   3,984.48x = 21,548,115.46
5. Step 5: Solve for x
   x = 21,548,115.46/3,984.48
6. Step 6: Final answer
   x = 5,408.01