Finding the Fourth Proportional to 28,688.72, 39,601.72 and 18,076.38

Step by Step Solution

1. Step 1: Write the proportion equation
   28,688.72 : 39,601.72 = 18,076.38 : x
2. Step 2: Convert to fraction form
   28,688.72/39,601.72 = 18,076.38/x
3. Step 3: Cross multiply
   28,688.72x = 39,601.72 × 18,076.38
4. Step 4: Simplify right side
   28,688.72x = 715,855,739.37
5. Step 5: Solve for x
   x = 715,855,739.37/28,688.72
6. Step 6: Final answer
   x = 24,952.52