Finding the Fourth Proportional to 3,936.21, 5,912.52 and 3,321.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,936.21 : 5,912.52 = 3,321.12 : x
2. Step 2: Convert to fraction form
   3,936.21/5,912.52 = 3,321.12/x
3. Step 3: Cross multiply
   3,936.21x = 5,912.52 × 3,321.12
4. Step 4: Simplify right side
   3,936.21x = 19,636,171.82
5. Step 5: Solve for x
   x = 19,636,171.82/3,936.21
6. Step 6: Final answer
   x = 4,988.60