Finding the Fourth Proportional to 1,488.24, 2,231.43 and 931.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.24 : 2,231.43 = 931.56 : x
2. Step 2: Convert to fraction form
   1,488.24/2,231.43 = 931.56/x
3. Step 3: Cross multiply
   1,488.24x = 2,231.43 × 931.56
4. Step 4: Simplify right side
   1,488.24x = 2,078,710.93
5. Step 5: Solve for x
   x = 2,078,710.93/1,488.24
6. Step 6: Final answer
   x = 1,396.76