Finding the Fourth Proportional to 2,111.44, 2,913.78 and 1,167.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.44 : 2,913.78 = 1,167.28 : x
2. Step 2: Convert to fraction form
   2,111.44/2,913.78 = 1,167.28/x
3. Step 3: Cross multiply
   2,111.44x = 2,913.78 × 1,167.28
4. Step 4: Simplify right side
   2,111.44x = 3,401,197.12
5. Step 5: Solve for x
   x = 3,401,197.12/2,111.44
6. Step 6: Final answer
   x = 1,610.84