Finding the Fourth Proportional to 13,116.75, 18,100.89 and 7,148.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,116.75 : 18,100.89 = 7,148.49 : x
2. Step 2: Convert to fraction form
   13,116.75/18,100.89 = 7,148.49/x
3. Step 3: Cross multiply
   13,116.75x = 18,100.89 × 7,148.49
4. Step 4: Simplify right side
   13,116.75x = 129,394,031.16
5. Step 5: Solve for x
   x = 129,394,031.16/13,116.75
6. Step 6: Final answer
   x = 9,864.79