Finding the Fourth Proportional to 1,530.36, 2,111.88 and 831.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.36 : 2,111.88 = 831.73 : x
2. Step 2: Convert to fraction form
   1,530.36/2,111.88 = 831.73/x
3. Step 3: Cross multiply
   1,530.36x = 2,111.88 × 831.73
4. Step 4: Simplify right side
   1,530.36x = 1,756,513.95
5. Step 5: Solve for x
   x = 1,756,513.95/1,530.36
6. Step 6: Final answer
   x = 1,147.78