Finding the Fourth Proportional to 17,380.78, 23,979.42 and 10,661.20

Step by Step Solution

1. Step 1: Write the proportion equation
   17,380.78 : 23,979.42 = 10,661.20 : x
2. Step 2: Convert to fraction form
   17,380.78/23,979.42 = 10,661.20/x
3. Step 3: Cross multiply
   17,380.78x = 23,979.42 × 10,661.20
4. Step 4: Simplify right side
   17,380.78x = 255,649,392.50
5. Step 5: Solve for x
   x = 255,649,392.50/17,380.78
6. Step 6: Final answer
   x = 14,708.74