Finding the Fourth Proportional to 13,116.89, 18,101.33 and 7,148.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,116.89 : 18,101.33 = 7,148.57 : x
2. Step 2: Convert to fraction form
   13,116.89/18,101.33 = 7,148.57/x
3. Step 3: Cross multiply
   13,116.89x = 18,101.33 × 7,148.57
4. Step 4: Simplify right side
   13,116.89x = 129,398,498.35
5. Step 5: Solve for x
   x = 129,398,498.35/13,116.89
6. Step 6: Final answer
   x = 9,865.03