Finding the Fourth Proportional to 21,972.48, 30,321.37 and 12,412.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,972.48 : 30,321.37 = 12,412.81 : x
2. Step 2: Convert to fraction form
   21,972.48/30,321.37 = 12,412.81/x
3. Step 3: Cross multiply
   21,972.48x = 30,321.37 × 12,412.81
4. Step 4: Simplify right side
   21,972.48x = 376,373,342.69
5. Step 5: Solve for x
   x = 376,373,342.69/21,972.48
6. Step 6: Final answer
   x = 17,129.31