Finding the Fourth Proportional to 1,055.10, 1,581.59 and 361.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.10 : 1,581.59 = 361.30 : x
2. Step 2: Convert to fraction form
   1,055.10/1,581.59 = 361.30/x
3. Step 3: Cross multiply
   1,055.10x = 1,581.59 × 361.30
4. Step 4: Simplify right side
   1,055.10x = 571,425.42
5. Step 5: Solve for x
   x = 571,425.42/1,055.10
6. Step 6: Final answer
   x = 541.58