Finding the Fourth Proportional to 12,426.72, 18,636.14 and 4,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,426.72 : 18,636.14 = 4,105.20 : x
2. Step 2: Convert to fraction form
   12,426.72/18,636.14 = 4,105.20/x
3. Step 3: Cross multiply
   12,426.72x = 18,636.14 × 4,105.20
4. Step 4: Simplify right side
   12,426.72x = 76,505,081.93
5. Step 5: Solve for x
   x = 76,505,081.93/12,426.72
6. Step 6: Final answer
   x = 6,156.50