Finding the Fourth Proportional to 3,979.02, 5,968.89 and 1,638.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,979.02 : 5,968.89 = 1,638.48 : x
2. Step 2: Convert to fraction form
   3,979.02/5,968.89 = 1,638.48/x
3. Step 3: Cross multiply
   3,979.02x = 5,968.89 × 1,638.48
4. Step 4: Simplify right side
   3,979.02x = 9,779,906.89
5. Step 5: Solve for x
   x = 9,779,906.89/3,979.02
6. Step 6: Final answer
   x = 2,457.87