Finding the Fourth Proportional to 3,881.10, 5,355.96 and 2,112.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,881.10 : 5,355.96 = 2,112.72 : x
2. Step 2: Convert to fraction form
   3,881.10/5,355.96 = 2,112.72/x
3. Step 3: Cross multiply
   3,881.10x = 5,355.96 × 2,112.72
4. Step 4: Simplify right side
   3,881.10x = 11,315,643.81
5. Step 5: Solve for x
   x = 11,315,643.81/3,881.10
6. Step 6: Final answer
   x = 2,915.58