Finding the Fourth Proportional to 13,109.38, 18,091.16 and 7,141.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.38 : 18,091.16 = 7,141.06 : x
2. Step 2: Convert to fraction form
   13,109.38/18,091.16 = 7,141.06/x
3. Step 3: Cross multiply
   13,109.38x = 18,091.16 × 7,141.06
4. Step 4: Simplify right side
   13,109.38x = 129,190,059.03
5. Step 5: Solve for x
   x = 129,190,059.03/13,109.38
6. Step 6: Final answer
   x = 9,854.78