Finding the Fourth Proportional to 1,167.81, 1,749.15 and 581.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.81 : 1,749.15 = 581.91 : x
2. Step 2: Convert to fraction form
   1,167.81/1,749.15 = 581.91/x
3. Step 3: Cross multiply
   1,167.81x = 1,749.15 × 581.91
4. Step 4: Simplify right side
   1,167.81x = 1,017,847.88
5. Step 5: Solve for x
   x = 1,017,847.88/1,167.81
6. Step 6: Final answer
   x = 871.59