Finding the Fourth Proportional to 12,085.32, 18,128.06 and 3,321.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.32 : 18,128.06 = 3,321.16 : x
2. Step 2: Convert to fraction form
   12,085.32/18,128.06 = 3,321.16/x
3. Step 3: Cross multiply
   12,085.32x = 18,128.06 × 3,321.16
4. Step 4: Simplify right side
   12,085.32x = 60,206,187.75
5. Step 5: Solve for x
   x = 60,206,187.75/12,085.32
6. Step 6: Final answer
   x = 4,981.76