Finding the Fourth Proportional to 7,168.37, 9,891.78 and 3,981.36

Step by Step Solution

1. Step 1: Write the proportion equation
   7,168.37 : 9,891.78 = 3,981.36 : x
2. Step 2: Convert to fraction form
   7,168.37/9,891.78 = 3,981.36/x
3. Step 3: Cross multiply
   7,168.37x = 9,891.78 × 3,981.36
4. Step 4: Simplify right side
   7,168.37x = 39,382,667.86
5. Step 5: Solve for x
   x = 39,382,667.86/7,168.37
6. Step 6: Final answer
   x = 5,493.95