Finding the Fourth Proportional to 28,185.72, 42,262.12 and 18,836.29

Step by Step Solution

1. Step 1: Write the proportion equation
   28,185.72 : 42,262.12 = 18,836.29 : x
2. Step 2: Convert to fraction form
   28,185.72/42,262.12 = 18,836.29/x
3. Step 3: Cross multiply
   28,185.72x = 42,262.12 × 18,836.29
4. Step 4: Simplify right side
   28,185.72x = 796,061,548.33
5. Step 5: Solve for x
   x = 796,061,548.33/28,185.72
6. Step 6: Final answer
   x = 28,243.43