Finding the Fourth Proportional to 1,529.92, 2,111.32 and 831.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,529.92 : 2,111.32 = 831.30 : x
2. Step 2: Convert to fraction form
   1,529.92/2,111.32 = 831.30/x
3. Step 3: Cross multiply
   1,529.92x = 2,111.32 × 831.30
4. Step 4: Simplify right side
   1,529.92x = 1,755,140.32
5. Step 5: Solve for x
   x = 1,755,140.32/1,529.92
6. Step 6: Final answer
   x = 1,147.21