Finding the Fourth Proportional to 3,570.78, 5,356.67 and 1,105.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,570.78 : 5,356.67 = 1,105.28 : x
2. Step 2: Convert to fraction form
   3,570.78/5,356.67 = 1,105.28/x
3. Step 3: Cross multiply
   3,570.78x = 5,356.67 × 1,105.28
4. Step 4: Simplify right side
   3,570.78x = 5,920,587.91
5. Step 5: Solve for x
   x = 5,920,587.91/3,570.78
6. Step 6: Final answer
   x = 1,658.07