Finding the Fourth Proportional to 2,164.67, 3,243.97 and 931.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.67 : 3,243.97 = 931.16 : x
2. Step 2: Convert to fraction form
   2,164.67/3,243.97 = 931.16/x
3. Step 3: Cross multiply
   2,164.67x = 3,243.97 × 931.16
4. Step 4: Simplify right side
   2,164.67x = 3,020,640.05
5. Step 5: Solve for x
   x = 3,020,640.05/2,164.67
6. Step 6: Final answer
   x = 1,395.43