Finding the Fourth Proportional to 1,139, 1,571.82 and 696.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139 : 1,571.82 = 696.83 : x
2. Step 2: Convert to fraction form
   1,139/1,571.82 = 696.83/x
3. Step 3: Cross multiply
   1,139x = 1,571.82 × 696.83
4. Step 4: Simplify right side
   1,139x = 1,095,291.33
5. Step 5: Solve for x
   x = 1,095,291.33/1,139
6. Step 6: Final answer
   x = 961.63