Finding the Fourth Proportional to 12,421.72, 18,628.62 and 4,100.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,421.72 : 18,628.62 = 4,100.18 : x
2. Step 2: Convert to fraction form
   12,421.72/18,628.62 = 4,100.18/x
3. Step 3: Cross multiply
   12,421.72x = 18,628.62 × 4,100.18
4. Step 4: Simplify right side
   12,421.72x = 76,380,695.15
5. Step 5: Solve for x
   x = 76,380,695.15/12,421.72
6. Step 6: Final answer
   x = 6,148.96