Finding the Fourth Proportional to 13,143.50, 18,116.42 and 9,316.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,143.50 : 18,116.42 = 9,316.42 : x
2. Step 2: Convert to fraction form
   13,143.50/18,116.42 = 9,316.42/x
3. Step 3: Cross multiply
   13,143.50x = 18,116.42 × 9,316.42
4. Step 4: Simplify right side
   13,143.50x = 168,780,177.62
5. Step 5: Solve for x
   x = 168,780,177.62/13,143.50
6. Step 6: Final answer
   x = 12,841.34