Finding the Fourth Proportional to 1,002.24, 1,382.58 and 931.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.24 : 1,382.58 = 931.91 : x
2. Step 2: Convert to fraction form
   1,002.24/1,382.58 = 931.91/x
3. Step 3: Cross multiply
   1,002.24x = 1,382.58 × 931.91
4. Step 4: Simplify right side
   1,002.24x = 1,288,433.21
5. Step 5: Solve for x
   x = 1,288,433.21/1,002.24
6. Step 6: Final answer
   x = 1,285.55