Finding the Fourth Proportional to 1,530.25, 2,111.79 and 831.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.25 : 2,111.79 = 831.67 : x
2. Step 2: Convert to fraction form
   1,530.25/2,111.79 = 831.67/x
3. Step 3: Cross multiply
   1,530.25x = 2,111.79 × 831.67
4. Step 4: Simplify right side
   1,530.25x = 1,756,312.39
5. Step 5: Solve for x
   x = 1,756,312.39/1,530.25
6. Step 6: Final answer
   x = 1,147.73