Finding the Fourth Proportional to 13,109.40, 18,091.35 and 7,443.95

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.40 : 18,091.35 = 7,443.95 : x
2. Step 2: Convert to fraction form
   13,109.40/18,091.35 = 7,443.95/x
3. Step 3: Cross multiply
   13,109.40x = 18,091.35 × 7,443.95
4. Step 4: Simplify right side
   13,109.40x = 134,671,014.38
5. Step 5: Solve for x
   x = 134,671,014.38/13,109.40
6. Step 6: Final answer
   x = 10,272.86