Finding the Fourth Proportional to 15,738.68, 21,719.39 and 8,665.10

Step by Step Solution

1. Step 1: Write the proportion equation
   15,738.68 : 21,719.39 = 8,665.10 : x
2. Step 2: Convert to fraction form
   15,738.68/21,719.39 = 8,665.10/x
3. Step 3: Cross multiply
   15,738.68x = 21,719.39 × 8,665.10
4. Step 4: Simplify right side
   15,738.68x = 188,200,725.64
5. Step 5: Solve for x
   x = 188,200,725.64/15,738.68
6. Step 6: Final answer
   x = 11,957.85