Finding the Fourth Proportional to 12,002.88, 18,012.42 and 4,211.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,002.88 : 18,012.42 = 4,211.76 : x
2. Step 2: Convert to fraction form
   12,002.88/18,012.42 = 4,211.76/x
3. Step 3: Cross multiply
   12,002.88x = 18,012.42 × 4,211.76
4. Step 4: Simplify right side
   12,002.88x = 75,863,990.06
5. Step 5: Solve for x
   x = 75,863,990.06/12,002.88
6. Step 6: Final answer
   x = 6,320.48