Finding the Fourth Proportional to 3,111.72, 4,667.42 and 1,163.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.72 : 4,667.42 = 1,163.78 : x
2. Step 2: Convert to fraction form
   3,111.72/4,667.42 = 1,163.78/x
3. Step 3: Cross multiply
   3,111.72x = 4,667.42 × 1,163.78
4. Step 4: Simplify right side
   3,111.72x = 5,431,820.89
5. Step 5: Solve for x
   x = 5,431,820.89/3,111.72
6. Step 6: Final answer
   x = 1,745.60