Finding the Fourth Proportional to 8,111.72, 12,165.42 and 2,917.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.72 : 12,165.42 = 2,917.64 : x
2. Step 2: Convert to fraction form
   8,111.72/12,165.42 = 2,917.64/x
3. Step 3: Cross multiply
   8,111.72x = 12,165.42 × 2,917.64
4. Step 4: Simplify right side
   8,111.72x = 35,494,316.01
5. Step 5: Solve for x
   x = 35,494,316.01/8,111.72
6. Step 6: Final answer
   x = 4,375.68