Finding the Fourth Proportional to 1,055.40, 1,581.54 and 568.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.40 : 1,581.54 = 568.28 : x
2. Step 2: Convert to fraction form
   1,055.40/1,581.54 = 568.28/x
3. Step 3: Cross multiply
   1,055.40x = 1,581.54 × 568.28
4. Step 4: Simplify right side
   1,055.40x = 898,757.55
5. Step 5: Solve for x
   x = 898,757.55/1,055.40
6. Step 6: Final answer
   x = 851.58