Finding the Fourth Proportional to 21,984.50, 30,338.72 and 11,912.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,984.50 : 30,338.72 = 11,912.94 : x
2. Step 2: Convert to fraction form
   21,984.50/30,338.72 = 11,912.94/x
3. Step 3: Cross multiply
   21,984.50x = 30,338.72 × 11,912.94
4. Step 4: Simplify right side
   21,984.50x = 361,423,217.31
5. Step 5: Solve for x
   x = 361,423,217.31/21,984.50
6. Step 6: Final answer
   x = 16,439.91