Finding the Fourth Proportional to 16,796.73, 23,179 and 9,139.77

Step by Step Solution

1. Step 1: Write the proportion equation
   16,796.73 : 23,179 = 9,139.77 : x
2. Step 2: Convert to fraction form
   16,796.73/23,179 = 9,139.77/x
3. Step 3: Cross multiply
   16,796.73x = 23,179 × 9,139.77
4. Step 4: Simplify right side
   16,796.73x = 211,850,728.83
5. Step 5: Solve for x
   x = 211,850,728.83/16,796.73
6. Step 6: Final answer
   x = 12,612.62