Finding the Fourth Proportional to 21,985.50, 30,339.99 and 12,049.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,985.50 : 30,339.99 = 12,049.50 : x
2. Step 2: Convert to fraction form
   21,985.50/30,339.99 = 12,049.50/x
3. Step 3: Cross multiply
   21,985.50x = 30,339.99 × 12,049.50
4. Step 4: Simplify right side
   21,985.50x = 365,581,709.51
5. Step 5: Solve for x
   x = 365,581,709.51/21,985.50
6. Step 6: Final answer
   x = 16,628.31