Finding the Fourth Proportional to 15,756.17, 21,743.98 and 8,683.05

Step by Step Solution

1. Step 1: Write the proportion equation
   15,756.17 : 21,743.98 = 8,683.05 : x
2. Step 2: Convert to fraction form
   15,756.17/21,743.98 = 8,683.05/x
3. Step 3: Cross multiply
   15,756.17x = 21,743.98 × 8,683.05
4. Step 4: Simplify right side
   15,756.17x = 188,804,065.54
5. Step 5: Solve for x
   x = 188,804,065.54/15,756.17
6. Step 6: Final answer
   x = 11,982.87