Finding the Fourth Proportional to 1,431.32, 1,975.32 and 842.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.32 : 1,975.32 = 842.31 : x
2. Step 2: Convert to fraction form
   1,431.32/1,975.32 = 842.31/x
3. Step 3: Cross multiply
   1,431.32x = 1,975.32 × 842.31
4. Step 4: Simplify right side
   1,431.32x = 1,663,831.79
5. Step 5: Solve for x
   x = 1,663,831.79/1,431.32
6. Step 6: Final answer
   x = 1,162.45