Finding the Fourth Proportional to 3,938.94, 5,436.34 and 2,993.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.94 : 5,436.34 = 2,993.20 : x
2. Step 2: Convert to fraction form
   3,938.94/5,436.34 = 2,993.20/x
3. Step 3: Cross multiply
   3,938.94x = 5,436.34 × 2,993.20
4. Step 4: Simplify right side
   3,938.94x = 16,272,052.89
5. Step 5: Solve for x
   x = 16,272,052.89/3,938.94
6. Step 6: Final answer
   x = 4,131.07