Finding the Fourth Proportional to 8,109.36, 12,164.76 and 2,916.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.36 : 12,164.76 = 2,916.72 : x
2. Step 2: Convert to fraction form
   8,109.36/12,164.76 = 2,916.72/x
3. Step 3: Cross multiply
   8,109.36x = 12,164.76 × 2,916.72
4. Step 4: Simplify right side
   8,109.36x = 35,481,198.79
5. Step 5: Solve for x
   x = 35,481,198.79/8,109.36
6. Step 6: Final answer
   x = 4,375.34