Finding the Fourth Proportional to 13,105.60, 18,085.92 and 7,440.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.60 : 18,085.92 = 7,440.16 : x
2. Step 2: Convert to fraction form
   13,105.60/18,085.92 = 7,440.16/x
3. Step 3: Cross multiply
   13,105.60x = 18,085.92 × 7,440.16
4. Step 4: Simplify right side
   13,105.60x = 134,562,138.55
5. Step 5: Solve for x
   x = 134,562,138.55/13,105.60
6. Step 6: Final answer
   x = 10,267.53