Finding the Fourth Proportional to 2,164.17, 3,245.66 and 931.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.17 : 3,245.66 = 931.31 : x
2. Step 2: Convert to fraction form
   2,164.17/3,245.66 = 931.31/x
3. Step 3: Cross multiply
   2,164.17x = 3,245.66 × 931.31
4. Step 4: Simplify right side
   2,164.17x = 3,022,715.61
5. Step 5: Solve for x
   x = 3,022,715.61/2,164.17
6. Step 6: Final answer
   x = 1,396.71