Finding the Fourth Proportional to 3,945.77, 5,451.71 and 3,112.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.77 : 5,451.71 = 3,112.82 : x
2. Step 2: Convert to fraction form
   3,945.77/5,451.71 = 3,112.82/x
3. Step 3: Cross multiply
   3,945.77x = 5,451.71 × 3,112.82
4. Step 4: Simplify right side
   3,945.77x = 16,970,149.10
5. Step 5: Solve for x
   x = 16,970,149.10/3,945.77
6. Step 6: Final answer
   x = 4,300.85