Finding the Fourth Proportional to 1,090.55, 1,504.37 and 691.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.55 : 1,504.37 = 691.49 : x
2. Step 2: Convert to fraction form
   1,090.55/1,504.37 = 691.49/x
3. Step 3: Cross multiply
   1,090.55x = 1,504.37 × 691.49
4. Step 4: Simplify right side
   1,090.55x = 1,040,262.30
5. Step 5: Solve for x
   x = 1,040,262.30/1,090.55
6. Step 6: Final answer
   x = 953.89