Finding the Fourth Proportional to 12,002.18, 18,005.07 and 4,209.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,002.18 : 18,005.07 = 4,209.62 : x
2. Step 2: Convert to fraction form
   12,002.18/18,005.07 = 4,209.62/x
3. Step 3: Cross multiply
   12,002.18x = 18,005.07 × 4,209.62
4. Step 4: Simplify right side
   12,002.18x = 75,794,502.77
5. Step 5: Solve for x
   x = 75,794,502.77/12,002.18
6. Step 6: Final answer
   x = 6,315.06