Finding the Fourth Proportional to 16,570.72, 24,855.72 and 9,640

Step by Step Solution

1. Step 1: Write the proportion equation
   16,570.72 : 24,855.72 = 9,640 : x
2. Step 2: Convert to fraction form
   16,570.72/24,855.72 = 9,640/x
3. Step 3: Cross multiply
   16,570.72x = 24,855.72 × 9,640
4. Step 4: Simplify right side
   16,570.72x = 239,609,140.80
5. Step 5: Solve for x
   x = 239,609,140.80/16,570.72
6. Step 6: Final answer
   x = 14,459.79