Finding the Fourth Proportional to 1,018.81, 1,405.76 and 587.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.81 : 1,405.76 = 587.55 : x
2. Step 2: Convert to fraction form
   1,018.81/1,405.76 = 587.55/x
3. Step 3: Cross multiply
   1,018.81x = 1,405.76 × 587.55
4. Step 4: Simplify right side
   1,018.81x = 825,956.62
5. Step 5: Solve for x
   x = 825,956.62/1,018.81
6. Step 6: Final answer
   x = 810.71