Finding the Fourth Proportional to 13,097.35, 18,074.82 and 7,128.73

Step by Step Solution

1. Step 1: Write the proportion equation
   13,097.35 : 18,074.82 = 7,128.73 : x
2. Step 2: Convert to fraction form
   13,097.35/18,074.82 = 7,128.73/x
3. Step 3: Cross multiply
   13,097.35x = 18,074.82 × 7,128.73
4. Step 4: Simplify right side
   13,097.35x = 128,850,511.58
5. Step 5: Solve for x
   x = 128,850,511.58/13,097.35
6. Step 6: Final answer
   x = 9,837.91