Finding the Fourth Proportional to 13,960.76, 20,913.72 and 8,105.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,960.76 : 20,913.72 = 8,105.12 : x
2. Step 2: Convert to fraction form
   13,960.76/20,913.72 = 8,105.12/x
3. Step 3: Cross multiply
   13,960.76x = 20,913.72 × 8,105.12
4. Step 4: Simplify right side
   13,960.76x = 169,508,210.25
5. Step 5: Solve for x
   x = 169,508,210.25/13,960.76
6. Step 6: Final answer
   x = 12,141.76