Finding the Fourth Proportional to 3,878.81, 5,353.94 and 3,680.43

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.81 : 5,353.94 = 3,680.43 : x
2. Step 2: Convert to fraction form
   3,878.81/5,353.94 = 3,680.43/x
3. Step 3: Cross multiply
   3,878.81x = 5,353.94 × 3,680.43
4. Step 4: Simplify right side
   3,878.81x = 19,704,801.39
5. Step 5: Solve for x
   x = 19,704,801.39/3,878.81
6. Step 6: Final answer
   x = 5,080.12