Finding the Fourth Proportional to 3,936.88, 5,432.78 and 2,168.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,936.88 : 5,432.78 = 2,168.50 : x
2. Step 2: Convert to fraction form
   3,936.88/5,432.78 = 2,168.50/x
3. Step 3: Cross multiply
   3,936.88x = 5,432.78 × 2,168.50
4. Step 4: Simplify right side
   3,936.88x = 11,780,983.43
5. Step 5: Solve for x
   x = 11,780,983.43/3,936.88
6. Step 6: Final answer
   x = 2,992.47