Finding the Fourth Proportional to 13,109.85, 18,091.57 and 7,141.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.85 : 18,091.57 = 7,141.50 : x
2. Step 2: Convert to fraction form
   13,109.85/18,091.57 = 7,141.50/x
3. Step 3: Cross multiply
   13,109.85x = 18,091.57 × 7,141.50
4. Step 4: Simplify right side
   13,109.85x = 129,200,947.16
5. Step 5: Solve for x
   x = 129,200,947.16/13,109.85
6. Step 6: Final answer
   x = 9,855.26