Finding the Fourth Proportional to 21,679.82, 29,917.52 and 12,119.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,679.82 : 29,917.52 = 12,119.72 : x
2. Step 2: Convert to fraction form
   21,679.82/29,917.52 = 12,119.72/x
3. Step 3: Cross multiply
   21,679.82x = 29,917.52 × 12,119.72
4. Step 4: Simplify right side
   21,679.82x = 362,591,755.31
5. Step 5: Solve for x
   x = 362,591,755.31/21,679.82
6. Step 6: Final answer
   x = 16,724.85