Finding the Fourth Proportional to 21,830.57, 30,118.83 and 13,329.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,830.57 : 30,118.83 = 13,329.62 : x
2. Step 2: Convert to fraction form
   21,830.57/30,118.83 = 13,329.62/x
3. Step 3: Cross multiply
   21,830.57x = 30,118.83 × 13,329.62
4. Step 4: Simplify right side
   21,830.57x = 401,472,408.15
5. Step 5: Solve for x
   x = 401,472,408.15/21,830.57
6. Step 6: Final answer
   x = 18,390.38