Finding the Fourth Proportional to 3,881.16, 5,355.86 and 2,112.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,881.16 : 5,355.86 = 2,112.72 : x
2. Step 2: Convert to fraction form
   3,881.16/5,355.86 = 2,112.72/x
3. Step 3: Cross multiply
   3,881.16x = 5,355.86 × 2,112.72
4. Step 4: Simplify right side
   3,881.16x = 11,315,432.54
5. Step 5: Solve for x
   x = 11,315,432.54/3,881.16
6. Step 6: Final answer
   x = 2,915.48