Finding the Fourth Proportional to 2,411.87, 3,618.36 and 931.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,411.87 : 3,618.36 = 931.31 : x
2. Step 2: Convert to fraction form
   2,411.87/3,618.36 = 931.31/x
3. Step 3: Cross multiply
   2,411.87x = 3,618.36 × 931.31
4. Step 4: Simplify right side
   2,411.87x = 3,369,796.76
5. Step 5: Solve for x
   x = 3,369,796.76/2,411.87
6. Step 6: Final answer
   x = 1,397.17