Finding the Fourth Proportional to 13,105.22, 18,085.55 and 7,440.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.22 : 18,085.55 = 7,440.21 : x
2. Step 2: Convert to fraction form
   13,105.22/18,085.55 = 7,440.21/x
3. Step 3: Cross multiply
   13,105.22x = 18,085.55 × 7,440.21
4. Step 4: Simplify right side
   13,105.22x = 134,560,252.76
5. Step 5: Solve for x
   x = 134,560,252.76/13,105.22
6. Step 6: Final answer
   x = 10,267.69