Finding the Fourth Proportional to 13,142.88, 18,137.52 and 7,174.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.88 : 18,137.52 = 7,174.80 : x
2. Step 2: Convert to fraction form
   13,142.88/18,137.52 = 7,174.80/x
3. Step 3: Cross multiply
   13,142.88x = 18,137.52 × 7,174.80
4. Step 4: Simplify right side
   13,142.88x = 130,133,078.50
5. Step 5: Solve for x
   x = 130,133,078.50/13,142.88
6. Step 6: Final answer
   x = 9,901.41