Finding the Fourth Proportional to 2,638.64, 3,958.38 and 995.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.64 : 3,958.38 = 995.31 : x
2. Step 2: Convert to fraction form
   2,638.64/3,958.38 = 995.31/x
3. Step 3: Cross multiply
   2,638.64x = 3,958.38 × 995.31
4. Step 4: Simplify right side
   2,638.64x = 3,939,815.20
5. Step 5: Solve for x
   x = 3,939,815.20/2,638.64
6. Step 6: Final answer
   x = 1,493.13