Finding the Fourth Proportional to 21,229.58, 31,800.59 and 12,437.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,229.58 : 31,800.59 = 12,437.82 : x
2. Step 2: Convert to fraction form
   21,229.58/31,800.59 = 12,437.82/x
3. Step 3: Cross multiply
   21,229.58x = 31,800.59 × 12,437.82
4. Step 4: Simplify right side
   21,229.58x = 395,530,014.31
5. Step 5: Solve for x
   x = 395,530,014.31/21,229.58
6. Step 6: Final answer
   x = 18,631.08