Finding the Fourth Proportional to 973.32, 1,339.59 and 831.15

Step by Step Solution

1. Step 1: Write the proportion equation
   973.32 : 1,339.59 = 831.15 : x
2. Step 2: Convert to fraction form
   973.32/1,339.59 = 831.15/x
3. Step 3: Cross multiply
   973.32x = 1,339.59 × 831.15
4. Step 4: Simplify right side
   973.32x = 1,113,400.23
5. Step 5: Solve for x
   x = 1,113,400.23/973.32
6. Step 6: Final answer
   x = 1,143.92