Finding the Fourth Proportional to 15,705.82, 21,673.78 and 8,632.09

Step by Step Solution

1. Step 1: Write the proportion equation
   15,705.82 : 21,673.78 = 8,632.09 : x
2. Step 2: Convert to fraction form
   15,705.82/21,673.78 = 8,632.09/x
3. Step 3: Cross multiply
   15,705.82x = 21,673.78 × 8,632.09
4. Step 4: Simplify right side
   15,705.82x = 187,090,019.60
5. Step 5: Solve for x
   x = 187,090,019.60/15,705.82
6. Step 6: Final answer
   x = 11,912.15