Finding the Fourth Proportional to 1,138.59, 1,570.83 and 696.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,138.59 : 1,570.83 = 696.33 : x
2. Step 2: Convert to fraction form
   1,138.59/1,570.83 = 696.33/x
3. Step 3: Cross multiply
   1,138.59x = 1,570.83 × 696.33
4. Step 4: Simplify right side
   1,138.59x = 1,093,816.05
5. Step 5: Solve for x
   x = 1,093,816.05/1,138.59
6. Step 6: Final answer
   x = 960.68