Finding the Fourth Proportional to 8,078.86, 12,115.86 and 5,305.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,078.86 : 12,115.86 = 5,305.42 : x
2. Step 2: Convert to fraction form
   8,078.86/12,115.86 = 5,305.42/x
3. Step 3: Cross multiply
   8,078.86x = 12,115.86 × 5,305.42
4. Step 4: Simplify right side
   8,078.86x = 64,279,725.96
5. Step 5: Solve for x
   x = 64,279,725.96/8,078.86
6. Step 6: Final answer
   x = 7,956.53