Finding the Fourth Proportional to 21,018.48, 28,992.30 and 12,514.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.48 : 28,992.30 = 12,514.56 : x
2. Step 2: Convert to fraction form
   21,018.48/28,992.30 = 12,514.56/x
3. Step 3: Cross multiply
   21,018.48x = 28,992.30 × 12,514.56
4. Step 4: Simplify right side
   21,018.48x = 362,825,877.89
5. Step 5: Solve for x
   x = 362,825,877.89/21,018.48
6. Step 6: Final answer
   x = 17,262.23