Finding the Fourth Proportional to 3,906.56, 5,388.72 and 3,381.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.56 : 5,388.72 = 3,381.68 : x
2. Step 2: Convert to fraction form
   3,906.56/5,388.72 = 3,381.68/x
3. Step 3: Cross multiply
   3,906.56x = 5,388.72 × 3,381.68
4. Step 4: Simplify right side
   3,906.56x = 18,222,926.65
5. Step 5: Solve for x
   x = 18,222,926.65/3,906.56
6. Step 6: Final answer
   x = 4,664.70