Finding the Fourth Proportional to 2,111.41, 2,913.71 and 1,167.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.41 : 2,913.71 = 1,167.20 : x
2. Step 2: Convert to fraction form
   2,111.41/2,913.71 = 1,167.20/x
3. Step 3: Cross multiply
   2,111.41x = 2,913.71 × 1,167.20
4. Step 4: Simplify right side
   2,111.41x = 3,400,882.31
5. Step 5: Solve for x
   x = 3,400,882.31/2,111.41
6. Step 6: Final answer
   x = 1,610.72