Finding the Fourth Proportional to 11,983.21, 17,978.68 and 7,831.33

Step by Step Solution

1. Step 1: Write the proportion equation
   11,983.21 : 17,978.68 = 7,831.33 : x
2. Step 2: Convert to fraction form
   11,983.21/17,978.68 = 7,831.33/x
3. Step 3: Cross multiply
   11,983.21x = 17,978.68 × 7,831.33
4. Step 4: Simplify right side
   11,983.21x = 140,796,976.04
5. Step 5: Solve for x
   x = 140,796,976.04/11,983.21
6. Step 6: Final answer
   x = 11,749.52