Finding the Fourth Proportional to 1,529.72, 2,111.01 and 831.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,529.72 : 2,111.01 = 831.09 : x
2. Step 2: Convert to fraction form
   1,529.72/2,111.01 = 831.09/x
3. Step 3: Cross multiply
   1,529.72x = 2,111.01 × 831.09
4. Step 4: Simplify right side
   1,529.72x = 1,754,448.78
5. Step 5: Solve for x
   x = 1,754,448.78/1,529.72
6. Step 6: Final answer
   x = 1,146.91