Finding the Fourth Proportional to 21,785.33, 30,063.77 and 12,223.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,785.33 : 30,063.77 = 12,223.90 : x
2. Step 2: Convert to fraction form
   21,785.33/30,063.77 = 12,223.90/x
3. Step 3: Cross multiply
   21,785.33x = 30,063.77 × 12,223.90
4. Step 4: Simplify right side
   21,785.33x = 367,496,518.10
5. Step 5: Solve for x
   x = 367,496,518.10/21,785.33
6. Step 6: Final answer
   x = 16,868.99