Finding the Fourth Proportional to 2,662.80, 3,993.12 and 931.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.80 : 3,993.12 = 931.02 : x
2. Step 2: Convert to fraction form
   2,662.80/3,993.12 = 931.02/x
3. Step 3: Cross multiply
   2,662.80x = 3,993.12 × 931.02
4. Step 4: Simplify right side
   2,662.80x = 3,717,674.58
5. Step 5: Solve for x
   x = 3,717,674.58/2,662.80
6. Step 6: Final answer
   x = 1,396.15