Finding the Fourth Proportional to 13,099.83, 18,078.14 and 7,131.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,099.83 : 18,078.14 = 7,131.59 : x
2. Step 2: Convert to fraction form
   13,099.83/18,078.14 = 7,131.59/x
3. Step 3: Cross multiply
   13,099.83x = 18,078.14 × 7,131.59
4. Step 4: Simplify right side
   13,099.83x = 128,925,939.25
5. Step 5: Solve for x
   x = 128,925,939.25/13,099.83
6. Step 6: Final answer
   x = 9,841.81