Finding the Fourth Proportional to 12,019.28, 18,005.42 and 8,270.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.28 : 18,005.42 = 8,270.39 : x
2. Step 2: Convert to fraction form
   12,019.28/18,005.42 = 8,270.39/x
3. Step 3: Cross multiply
   12,019.28x = 18,005.42 × 8,270.39
4. Step 4: Simplify right side
   12,019.28x = 148,911,714.13
5. Step 5: Solve for x
   x = 148,911,714.13/12,019.28
6. Step 6: Final answer
   x = 12,389.41