Finding the Fourth Proportional to 13,143.83, 18,138.42 and 7,175.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,143.83 : 18,138.42 = 7,175.49 : x
2. Step 2: Convert to fraction form
   13,143.83/18,138.42 = 7,175.49/x
3. Step 3: Cross multiply
   13,143.83x = 18,138.42 × 7,175.49
4. Step 4: Simplify right side
   13,143.83x = 130,152,051.33
5. Step 5: Solve for x
   x = 130,152,051.33/13,143.83
6. Step 6: Final answer
   x = 9,902.14