Finding the Fourth Proportional to 3,880.14, 5,354.81 and 2,111.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,880.14 : 5,354.81 = 2,111.71 : x
2. Step 2: Convert to fraction form
   3,880.14/5,354.81 = 2,111.71/x
3. Step 3: Cross multiply
   3,880.14x = 5,354.81 × 2,111.71
4. Step 4: Simplify right side
   3,880.14x = 11,307,805.83
5. Step 5: Solve for x
   x = 11,307,805.83/3,880.14
6. Step 6: Final answer
   x = 2,914.28