Finding the Fourth Proportional to 1,150.74, 1,585.76 and 818.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.74 : 1,585.76 = 818.60 : x
2. Step 2: Convert to fraction form
   1,150.74/1,585.76 = 818.60/x
3. Step 3: Cross multiply
   1,150.74x = 1,585.76 × 818.60
4. Step 4: Simplify right side
   1,150.74x = 1,298,103.14
5. Step 5: Solve for x
   x = 1,298,103.14/1,150.74
6. Step 6: Final answer
   x = 1,128.06