Finding the Fourth Proportional to 12,018.72, 18,030.51 and 4,229.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,018.72 : 18,030.51 = 4,229.76 : x
2. Step 2: Convert to fraction form
   12,018.72/18,030.51 = 4,229.76/x
3. Step 3: Cross multiply
   12,018.72x = 18,030.51 × 4,229.76
4. Step 4: Simplify right side
   12,018.72x = 76,264,729.98
5. Step 5: Solve for x
   x = 76,264,729.98/12,018.72
6. Step 6: Final answer
   x = 6,345.50