Finding the Fourth Proportional to 8,164.86, 11,278.89 and 7,861.41

Step by Step Solution

1. Step 1: Write the proportion equation
   8,164.86 : 11,278.89 = 7,861.41 : x
2. Step 2: Convert to fraction form
   8,164.86/11,278.89 = 7,861.41/x
3. Step 3: Cross multiply
   8,164.86x = 11,278.89 × 7,861.41
4. Step 4: Simplify right side
   8,164.86x = 88,667,978.63
5. Step 5: Solve for x
   x = 88,667,978.63/8,164.86
6. Step 6: Final answer
   x = 10,859.71