Finding the Fourth Proportional to 1,090.56, 1,504.75 and 648.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.56 : 1,504.75 = 648.57 : x
2. Step 2: Convert to fraction form
   1,090.56/1,504.75 = 648.57/x
3. Step 3: Cross multiply
   1,090.56x = 1,504.75 × 648.57
4. Step 4: Simplify right side
   1,090.56x = 975,930.32
5. Step 5: Solve for x
   x = 975,930.32/1,090.56
6. Step 6: Final answer
   x = 894.89