Finding the Fourth Proportional to 1,356.39, 1,871.95 and 825.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.39 : 1,871.95 = 825.31 : x
2. Step 2: Convert to fraction form
   1,356.39/1,871.95 = 825.31/x
3. Step 3: Cross multiply
   1,356.39x = 1,871.95 × 825.31
4. Step 4: Simplify right side
   1,356.39x = 1,544,933.65
5. Step 5: Solve for x
   x = 1,544,933.65/1,356.39
6. Step 6: Final answer
   x = 1,139.01