Finding the Fourth Proportional to 12,002.68, 18,005.82 and 4,210.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,002.68 : 18,005.82 = 4,210.12 : x
2. Step 2: Convert to fraction form
   12,002.68/18,005.82 = 4,210.12/x
3. Step 3: Cross multiply
   12,002.68x = 18,005.82 × 4,210.12
4. Step 4: Simplify right side
   12,002.68x = 75,806,662.90
5. Step 5: Solve for x
   x = 75,806,662.90/12,002.68
6. Step 6: Final answer
   x = 6,315.81