Finding the Fourth Proportional to 12,021.28, 18,031.86 and 3,256.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,021.28 : 18,031.86 = 3,256.18 : x
2. Step 2: Convert to fraction form
   12,021.28/18,031.86 = 3,256.18/x
3. Step 3: Cross multiply
   12,021.28x = 18,031.86 × 3,256.18
4. Step 4: Simplify right side
   12,021.28x = 58,714,981.89
5. Step 5: Solve for x
   x = 58,714,981.89/12,021.28
6. Step 6: Final answer
   x = 4,884.25