Finding the Fourth Proportional to 12,085.69, 18,129.21 and 3,320.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.69 : 18,129.21 = 3,320.41 : x
2. Step 2: Convert to fraction form
   12,085.69/18,129.21 = 3,320.41/x
3. Step 3: Cross multiply
   12,085.69x = 18,129.21 × 3,320.41
4. Step 4: Simplify right side
   12,085.69x = 60,196,410.18
5. Step 5: Solve for x
   x = 60,196,410.18/12,085.69
6. Step 6: Final answer
   x = 4,980.80