Finding the Fourth Proportional to 2,111.36, 2,913.68 and 1,167.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.36 : 2,913.68 = 1,167.20 : x
2. Step 2: Convert to fraction form
   2,111.36/2,913.68 = 1,167.20/x
3. Step 3: Cross multiply
   2,111.36x = 2,913.68 × 1,167.20
4. Step 4: Simplify right side
   2,111.36x = 3,400,847.30
5. Step 5: Solve for x
   x = 3,400,847.30/2,111.36
6. Step 6: Final answer
   x = 1,610.74