Finding the Fourth Proportional to 28,496.72, 42,729.42 and 8,769.80

Step by Step Solution

1. Step 1: Write the proportion equation
   28,496.72 : 42,729.42 = 8,769.80 : x
2. Step 2: Convert to fraction form
   28,496.72/42,729.42 = 8,769.80/x
3. Step 3: Cross multiply
   28,496.72x = 42,729.42 × 8,769.80
4. Step 4: Simplify right side
   28,496.72x = 374,728,467.52
5. Step 5: Solve for x
   x = 374,728,467.52/28,496.72
6. Step 6: Final answer
   x = 13,149.88