Finding the Fourth Proportional to 12,288.16, 18,431.60 and 3,968.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,288.16 : 18,431.60 = 3,968.02 : x
2. Step 2: Convert to fraction form
   12,288.16/18,431.60 = 3,968.02/x
3. Step 3: Cross multiply
   12,288.16x = 18,431.60 × 3,968.02
4. Step 4: Simplify right side
   12,288.16x = 73,136,957.43
5. Step 5: Solve for x
   x = 73,136,957.43/12,288.16
6. Step 6: Final answer
   x = 5,951.82