Finding the Fourth Proportional to 21,825.88, 30,118.29 and 12,871.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,825.88 : 30,118.29 = 12,871.33 : x
2. Step 2: Convert to fraction form
   21,825.88/30,118.29 = 12,871.33/x
3. Step 3: Cross multiply
   21,825.88x = 30,118.29 × 12,871.33
4. Step 4: Simplify right side
   21,825.88x = 387,662,449.63
5. Step 5: Solve for x
   x = 387,662,449.63/21,825.88
6. Step 6: Final answer
   x = 17,761.60