Finding the Fourth Proportional to 1,529.84, 2,111.20 and 831.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,529.84 : 2,111.20 = 831.22 : x
2. Step 2: Convert to fraction form
   1,529.84/2,111.20 = 831.22/x
3. Step 3: Cross multiply
   1,529.84x = 2,111.20 × 831.22
4. Step 4: Simplify right side
   1,529.84x = 1,754,870.06
5. Step 5: Solve for x
   x = 1,754,870.06/1,529.84
6. Step 6: Final answer
   x = 1,147.09