Finding the Fourth Proportional to 12,105.10, 16,712.31 and 7,857.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,105.10 : 16,712.31 = 7,857.82 : x
2. Step 2: Convert to fraction form
   12,105.10/16,712.31 = 7,857.82/x
3. Step 3: Cross multiply
   12,105.10x = 16,712.31 × 7,857.82
4. Step 4: Simplify right side
   12,105.10x = 131,322,323.76
5. Step 5: Solve for x
   x = 131,322,323.76/12,105.10
6. Step 6: Final answer
   x = 10,848.51