Finding the Fourth Proportional to 10,879.50, 15,013.71 and 5,911.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,879.50 : 15,013.71 = 5,911.50 : x
2. Step 2: Convert to fraction form
   10,879.50/15,013.71 = 5,911.50/x
3. Step 3: Cross multiply
   10,879.50x = 15,013.71 × 5,911.50
4. Step 4: Simplify right side
   10,879.50x = 88,753,546.67
5. Step 5: Solve for x
   x = 88,753,546.67/10,879.50
6. Step 6: Final answer
   x = 8,157.87