Finding the Fourth Proportional to 15,755.72, 21,742.83 and 8,681.99

Step by Step Solution

1. Step 1: Write the proportion equation
   15,755.72 : 21,742.83 = 8,681.99 : x
2. Step 2: Convert to fraction form
   15,755.72/21,742.83 = 8,681.99/x
3. Step 3: Cross multiply
   15,755.72x = 21,742.83 × 8,681.99
4. Step 4: Simplify right side
   15,755.72x = 188,770,923.92
5. Step 5: Solve for x
   x = 188,770,923.92/15,755.72
6. Step 6: Final answer
   x = 11,981.11