Finding the Fourth Proportional to 12,279.82, 18,405.46 and 7,018.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,279.82 : 18,405.46 = 7,018.52 : x
2. Step 2: Convert to fraction form
   12,279.82/18,405.46 = 7,018.52/x
3. Step 3: Cross multiply
   12,279.82x = 18,405.46 × 7,018.52
4. Step 4: Simplify right side
   12,279.82x = 129,179,089.12
5. Step 5: Solve for x
   x = 129,179,089.12/12,279.82
6. Step 6: Final answer
   x = 10,519.62