Finding the Fourth Proportional to 2,662.45, 3,995.57 and 931.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.45 : 3,995.57 = 931.09 : x
2. Step 2: Convert to fraction form
   2,662.45/3,995.57 = 931.09/x
3. Step 3: Cross multiply
   2,662.45x = 3,995.57 × 931.09
4. Step 4: Simplify right side
   2,662.45x = 3,720,235.27
5. Step 5: Solve for x
   x = 3,720,235.27/2,662.45
6. Step 6: Final answer
   x = 1,397.30