Finding the Fourth Proportional to 21,716.82, 29,969.21 and 11,780.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,716.82 : 29,969.21 = 11,780.82 : x
2. Step 2: Convert to fraction form
   21,716.82/29,969.21 = 11,780.82/x
3. Step 3: Cross multiply
   21,716.82x = 29,969.21 × 11,780.82
4. Step 4: Simplify right side
   21,716.82x = 353,061,868.55
5. Step 5: Solve for x
   x = 353,061,868.55/21,716.82
6. Step 6: Final answer
   x = 16,257.53