Finding the Fourth Proportional to 1,007.57, 1,388.44 and 727.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.57 : 1,388.44 = 727.31 : x
2. Step 2: Convert to fraction form
   1,007.57/1,388.44 = 727.31/x
3. Step 3: Cross multiply
   1,007.57x = 1,388.44 × 727.31
4. Step 4: Simplify right side
   1,007.57x = 1,009,826.30
5. Step 5: Solve for x
   x = 1,009,826.30/1,007.57
6. Step 6: Final answer
   x = 1,002.24