Finding the Fourth Proportional to 21,235.11, 29,300.16 and 12,279.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,235.11 : 29,300.16 = 12,279.33 : x
2. Step 2: Convert to fraction form
   21,235.11/29,300.16 = 12,279.33/x
3. Step 3: Cross multiply
   21,235.11x = 29,300.16 × 12,279.33
4. Step 4: Simplify right side
   21,235.11x = 359,786,333.69
5. Step 5: Solve for x
   x = 359,786,333.69/21,235.11
6. Step 6: Final answer
   x = 16,942.99