Finding the Fourth Proportional to 23,012.80, 31,777.59 and 21,831.82

Step by Step Solution

1. Step 1: Write the proportion equation
   23,012.80 : 31,777.59 = 21,831.82 : x
2. Step 2: Convert to fraction form
   23,012.80/31,777.59 = 21,831.82/x
3. Step 3: Cross multiply
   23,012.80x = 31,777.59 × 21,831.82
4. Step 4: Simplify right side
   23,012.80x = 693,762,624.91
5. Step 5: Solve for x
   x = 693,762,624.91/23,012.80
6. Step 6: Final answer
   x = 30,146.82