Finding the Fourth Proportional to 13,109.58, 18,091.46 and 7,141.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.58 : 18,091.46 = 7,141.28 : x
2. Step 2: Convert to fraction form
   13,109.58/18,091.46 = 7,141.28/x
3. Step 3: Cross multiply
   13,109.58x = 18,091.46 × 7,141.28
4. Step 4: Simplify right side
   13,109.58x = 129,196,181.47
5. Step 5: Solve for x
   x = 129,196,181.47/13,109.58
6. Step 6: Final answer
   x = 9,855.10