Finding the Fourth Proportional to 13,105.86, 18,076.80 and 12,671.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.86 : 18,076.80 = 12,671.91 : x
2. Step 2: Convert to fraction form
   13,105.86/18,076.80 = 12,671.91/x
3. Step 3: Cross multiply
   13,105.86x = 18,076.80 × 12,671.91
4. Step 4: Simplify right side
   13,105.86x = 229,067,582.69
5. Step 5: Solve for x
   x = 229,067,582.69/13,105.86
6. Step 6: Final answer
   x = 17,478.26