Finding the Fourth Proportional to 3,942.24, 5,906.40 and 3,513.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,942.24 : 5,906.40 = 3,513.21 : x
2. Step 2: Convert to fraction form
   3,942.24/5,906.40 = 3,513.21/x
3. Step 3: Cross multiply
   3,942.24x = 5,906.40 × 3,513.21
4. Step 4: Simplify right side
   3,942.24x = 20,750,423.54
5. Step 5: Solve for x
   x = 20,750,423.54/3,942.24
6. Step 6: Final answer
   x = 5,263.61