Finding the Fourth Proportional to 1,529.96, 2,111.31 and 831.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,529.96 : 2,111.31 = 831.32 : x
2. Step 2: Convert to fraction form
   1,529.96/2,111.31 = 831.32/x
3. Step 3: Cross multiply
   1,529.96x = 2,111.31 × 831.32
4. Step 4: Simplify right side
   1,529.96x = 1,755,174.23
5. Step 5: Solve for x
   x = 1,755,174.23/1,529.96
6. Step 6: Final answer
   x = 1,147.20