Finding the Fourth Proportional to 3,887.56, 5,831.38 and 3,112.49

Step by Step Solution

1. Step 1: Write the proportion equation
   3,887.56 : 5,831.38 = 3,112.49 : x
2. Step 2: Convert to fraction form
   3,887.56/5,831.38 = 3,112.49/x
3. Step 3: Cross multiply
   3,887.56x = 5,831.38 × 3,112.49
4. Step 4: Simplify right side
   3,887.56x = 18,150,111.94
5. Step 5: Solve for x
   x = 18,150,111.94/3,887.56
6. Step 6: Final answer
   x = 4,668.77