Finding the Fourth Proportional to 12,087.33, 18,128.89 and 3,320.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,087.33 : 18,128.89 = 3,320.16 : x
2. Step 2: Convert to fraction form
   12,087.33/18,128.89 = 3,320.16/x
3. Step 3: Cross multiply
   12,087.33x = 18,128.89 × 3,320.16
4. Step 4: Simplify right side
   12,087.33x = 60,190,815.42
5. Step 5: Solve for x
   x = 60,190,815.42/12,087.33
6. Step 6: Final answer
   x = 4,979.66