Finding the Fourth Proportional to 13,116.24, 18,099.88 and 7,147.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,116.24 : 18,099.88 = 7,147.78 : x
2. Step 2: Convert to fraction form
   13,116.24/18,099.88 = 7,147.78/x
3. Step 3: Cross multiply
   13,116.24x = 18,099.88 × 7,147.78
4. Step 4: Simplify right side
   13,116.24x = 129,373,917.25
5. Step 5: Solve for x
   x = 129,373,917.25/13,116.24
6. Step 6: Final answer
   x = 9,863.65