Finding the Fourth Proportional to 3,936.54, 5,432.42 and 2,168.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,936.54 : 5,432.42 = 2,168.15 : x
2. Step 2: Convert to fraction form
   3,936.54/5,432.42 = 2,168.15/x
3. Step 3: Cross multiply
   3,936.54x = 5,432.42 × 2,168.15
4. Step 4: Simplify right side
   3,936.54x = 11,778,263.42
5. Step 5: Solve for x
   x = 11,778,263.42/3,936.54
6. Step 6: Final answer
   x = 2,992.03