Finding the Fourth Proportional to 1,139.22, 1,571.34 and 697.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.22 : 1,571.34 = 697.34 : x
2. Step 2: Convert to fraction form
   1,139.22/1,571.34 = 697.34/x
3. Step 3: Cross multiply
   1,139.22x = 1,571.34 × 697.34
4. Step 4: Simplify right side
   1,139.22x = 1,095,758.24
5. Step 5: Solve for x
   x = 1,095,758.24/1,139.22
6. Step 6: Final answer
   x = 961.85