Finding the Fourth Proportional to 11,688.57, 17,506.71 and 5,439.23

Step by Step Solution

1. Step 1: Write the proportion equation
   11,688.57 : 17,506.71 = 5,439.23 : x
2. Step 2: Convert to fraction form
   11,688.57/17,506.71 = 5,439.23/x
3. Step 3: Cross multiply
   11,688.57x = 17,506.71 × 5,439.23
4. Step 4: Simplify right side
   11,688.57x = 95,222,934.70
5. Step 5: Solve for x
   x = 95,222,934.70/11,688.57
6. Step 6: Final answer
   x = 8,146.67