Finding the Fourth Proportional to 1,530.61, 2,112.22 and 831.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.61 : 2,112.22 = 831.98 : x
2. Step 2: Convert to fraction form
   1,530.61/2,112.22 = 831.98/x
3. Step 3: Cross multiply
   1,530.61x = 2,112.22 × 831.98
4. Step 4: Simplify right side
   1,530.61x = 1,757,324.80
5. Step 5: Solve for x
   x = 1,757,324.80/1,530.61
6. Step 6: Final answer
   x = 1,148.12