Finding the Fourth Proportional to 17,137.98, 23,661.72 and 13,179.78

Step by Step Solution

1. Step 1: Write the proportion equation
   17,137.98 : 23,661.72 = 13,179.78 : x
2. Step 2: Convert to fraction form
   17,137.98/23,661.72 = 13,179.78/x
3. Step 3: Cross multiply
   17,137.98x = 23,661.72 × 13,179.78
4. Step 4: Simplify right side
   17,137.98x = 311,856,264.02
5. Step 5: Solve for x
   x = 311,856,264.02/17,137.98
6. Step 6: Final answer
   x = 18,196.79