Finding the Fourth Proportional to 21,321.84, 29,424.33 and 12,369.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,321.84 : 29,424.33 = 12,369.50 : x
2. Step 2: Convert to fraction form
   21,321.84/29,424.33 = 12,369.50/x
3. Step 3: Cross multiply
   21,321.84x = 29,424.33 × 12,369.50
4. Step 4: Simplify right side
   21,321.84x = 363,964,249.94
5. Step 5: Solve for x
   x = 363,964,249.94/21,321.84
6. Step 6: Final answer
   x = 17,070.02