Finding the Fourth Proportional to 1,054.85, 1,581.89 and 361.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.85 : 1,581.89 = 361.33 : x
2. Step 2: Convert to fraction form
   1,054.85/1,581.89 = 361.33/x
3. Step 3: Cross multiply
   1,054.85x = 1,581.89 × 361.33
4. Step 4: Simplify right side
   1,054.85x = 571,584.43
5. Step 5: Solve for x
   x = 571,584.43/1,054.85
6. Step 6: Final answer
   x = 541.86