Finding the Fourth Proportional to 13,143.05, 18,137.32 and 7,174.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,143.05 : 18,137.32 = 7,174.72 : x
2. Step 2: Convert to fraction form
   13,143.05/18,137.32 = 7,174.72/x
3. Step 3: Cross multiply
   13,143.05x = 18,137.32 × 7,174.72
4. Step 4: Simplify right side
   13,143.05x = 130,130,192.55
5. Step 5: Solve for x
   x = 130,130,192.55/13,143.05
6. Step 6: Final answer
   x = 9,901.07