Finding the Fourth Proportional to 21,281.78, 29,367.72 and 12,206.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,281.78 : 29,367.72 = 12,206.67 : x
2. Step 2: Convert to fraction form
   21,281.78/29,367.72 = 12,206.67/x
3. Step 3: Cross multiply
   21,281.78x = 29,367.72 × 12,206.67
4. Step 4: Simplify right side
   21,281.78x = 358,482,066.69
5. Step 5: Solve for x
   x = 358,482,066.69/21,281.78
6. Step 6: Final answer
   x = 16,844.56