Finding the Fourth Proportional to 2,491.20, 3,736.91 and 931.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,491.20 : 3,736.91 = 931.05 : x
2. Step 2: Convert to fraction form
   2,491.20/3,736.91 = 931.05/x
3. Step 3: Cross multiply
   2,491.20x = 3,736.91 × 931.05
4. Step 4: Simplify right side
   2,491.20x = 3,479,231.39
5. Step 5: Solve for x
   x = 3,479,231.39/2,491.20
6. Step 6: Final answer
   x = 1,396.61