Finding the Fourth Proportional to 12,879.05, 19,314.38 and 4,111.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,879.05 : 19,314.38 = 4,111.88 : x
2. Step 2: Convert to fraction form
   12,879.05/19,314.38 = 4,111.88/x
3. Step 3: Cross multiply
   12,879.05x = 19,314.38 × 4,111.88
4. Step 4: Simplify right side
   12,879.05x = 79,418,326.54
5. Step 5: Solve for x
   x = 79,418,326.54/12,879.05
6. Step 6: Final answer
   x = 6,166.48