Finding the Fourth Proportional to 8,111.36, 12,167.76 and 2,918.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.36 : 12,167.76 = 2,918.72 : x
2. Step 2: Convert to fraction form
   8,111.36/12,167.76 = 2,918.72/x
3. Step 3: Cross multiply
   8,111.36x = 12,167.76 × 2,918.72
4. Step 4: Simplify right side
   8,111.36x = 35,514,284.47
5. Step 5: Solve for x
   x = 35,514,284.47/8,111.36
6. Step 6: Final answer
   x = 4,378.34