Finding the Fourth Proportional to 13,109.91, 18,091.56 and 7,141.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.91 : 18,091.56 = 7,141.59 : x
2. Step 2: Convert to fraction form
   13,109.91/18,091.56 = 7,141.59/x
3. Step 3: Cross multiply
   13,109.91x = 18,091.56 × 7,141.59
4. Step 4: Simplify right side
   13,109.91x = 129,202,503.98
5. Step 5: Solve for x
   x = 129,202,503.98/13,109.91
6. Step 6: Final answer
   x = 9,855.33