Finding the Fourth Proportional to 1,530.31, 2,111.83 and 831.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.31 : 2,111.83 = 831.69 : x
2. Step 2: Convert to fraction form
   1,530.31/2,111.83 = 831.69/x
3. Step 3: Cross multiply
   1,530.31x = 2,111.83 × 831.69
4. Step 4: Simplify right side
   1,530.31x = 1,756,387.89
5. Step 5: Solve for x
   x = 1,756,387.89/1,530.31
6. Step 6: Final answer
   x = 1,147.73