Finding the Fourth Proportional to 28,809, 39,756.42 and 16,234.20

Step by Step Solution

1. Step 1: Write the proportion equation
   28,809 : 39,756.42 = 16,234.20 : x
2. Step 2: Convert to fraction form
   28,809/39,756.42 = 16,234.20/x
3. Step 3: Cross multiply
   28,809x = 39,756.42 × 16,234.20
4. Step 4: Simplify right side
   28,809x = 645,413,673.56
5. Step 5: Solve for x
   x = 645,413,673.56/28,809
6. Step 6: Final answer
   x = 22,403.20