Finding the Fourth Proportional to 3,858.54, 5,361.72 and 3,818.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,858.54 : 5,361.72 = 3,818.40 : x
2. Step 2: Convert to fraction form
   3,858.54/5,361.72 = 3,818.40/x
3. Step 3: Cross multiply
   3,858.54x = 5,361.72 × 3,818.40
4. Step 4: Simplify right side
   3,858.54x = 20,473,191.65
5. Step 5: Solve for x
   x = 20,473,191.65/3,858.54
6. Step 6: Final answer
   x = 5,305.94