Finding the Fourth Proportional to 3,880.10, 5,354.56 and 2,111.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,880.10 : 5,354.56 = 2,111.72 : x
2. Step 2: Convert to fraction form
   3,880.10/5,354.56 = 2,111.72/x
3. Step 3: Cross multiply
   3,880.10x = 5,354.56 × 2,111.72
4. Step 4: Simplify right side
   3,880.10x = 11,307,299.39
5. Step 5: Solve for x
   x = 11,307,299.39/3,880.10
6. Step 6: Final answer
   x = 2,914.18