Finding the Fourth Proportional to 21,300.30, 31,921.29 and 13,514.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.30 : 31,921.29 = 13,514.58 : x
2. Step 2: Convert to fraction form
   21,300.30/31,921.29 = 13,514.58/x
3. Step 3: Cross multiply
   21,300.30x = 31,921.29 × 13,514.58
4. Step 4: Simplify right side
   21,300.30x = 431,402,827.41
5. Step 5: Solve for x
   x = 431,402,827.41/21,300.30
6. Step 6: Final answer
   x = 20,253.37