Finding the Fourth Proportional to 12,879.54, 17,773.77 and 7,843.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,879.54 : 17,773.77 = 7,843.76 : x
2. Step 2: Convert to fraction form
   12,879.54/17,773.77 = 7,843.76/x
3. Step 3: Cross multiply
   12,879.54x = 17,773.77 × 7,843.76
4. Step 4: Simplify right side
   12,879.54x = 139,413,201.20
5. Step 5: Solve for x
   x = 139,413,201.20/12,879.54
6. Step 6: Final answer
   x = 10,824.39