Finding the Fourth Proportional to 3,880.29, 5,354.81 and 2,111.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,880.29 : 5,354.81 = 2,111.90 : x
2. Step 2: Convert to fraction form
   3,880.29/5,354.81 = 2,111.90/x
3. Step 3: Cross multiply
   3,880.29x = 5,354.81 × 2,111.90
4. Step 4: Simplify right side
   3,880.29x = 11,308,785.91
5. Step 5: Solve for x
   x = 11,308,785.91/3,880.29
6. Step 6: Final answer
   x = 2,914.42