Finding the Fourth Proportional to 12,085.46, 18,128.40 and 3,320.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.46 : 18,128.40 = 3,320.32 : x
2. Step 2: Convert to fraction form
   12,085.46/18,128.40 = 3,320.32/x
3. Step 3: Cross multiply
   12,085.46x = 18,128.40 × 3,320.32
4. Step 4: Simplify right side
   12,085.46x = 60,192,089.09
5. Step 5: Solve for x
   x = 60,192,089.09/12,085.46
6. Step 6: Final answer
   x = 4,980.54