Finding the Fourth Proportional to 935.69, 1,402.72 and 570.78

Step by Step Solution

1. Step 1: Write the proportion equation
   935.69 : 1,402.72 = 570.78 : x
2. Step 2: Convert to fraction form
   935.69/1,402.72 = 570.78/x
3. Step 3: Cross multiply
   935.69x = 1,402.72 × 570.78
4. Step 4: Simplify right side
   935.69x = 800,643.09
5. Step 5: Solve for x
   x = 800,643.09/935.69
6. Step 6: Final answer
   x = 855.68