Finding the Fourth Proportional to 13,109.58, 18,091.53 and 7,141.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.58 : 18,091.53 = 7,141.55 : x
2. Step 2: Convert to fraction form
   13,109.58/18,091.53 = 7,141.55/x
3. Step 3: Cross multiply
   13,109.58x = 18,091.53 × 7,141.55
4. Step 4: Simplify right side
   13,109.58x = 129,201,475.61
5. Step 5: Solve for x
   x = 129,201,475.61/13,109.58
6. Step 6: Final answer
   x = 9,855.50