Finding the Fourth Proportional to 1,090.89, 1,635.86 and 397.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.89 : 1,635.86 = 397.33 : x
2. Step 2: Convert to fraction form
   1,090.89/1,635.86 = 397.33/x
3. Step 3: Cross multiply
   1,090.89x = 1,635.86 × 397.33
4. Step 4: Simplify right side
   1,090.89x = 649,976.25
5. Step 5: Solve for x
   x = 649,976.25/1,090.89
6. Step 6: Final answer
   x = 595.82