Finding the Fourth Proportional to 1,563.69, 2,157.89 and 855.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.69 : 2,157.89 = 855.48 : x
2. Step 2: Convert to fraction form
   1,563.69/2,157.89 = 855.48/x
3. Step 3: Cross multiply
   1,563.69x = 2,157.89 × 855.48
4. Step 4: Simplify right side
   1,563.69x = 1,846,027.46
5. Step 5: Solve for x
   x = 1,846,027.46/1,563.69
6. Step 6: Final answer
   x = 1,180.56