Finding the Fourth Proportional to 21,072.16, 29,069.71 and 13,514.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,072.16 : 29,069.71 = 13,514.86 : x
2. Step 2: Convert to fraction form
   21,072.16/29,069.71 = 13,514.86/x
3. Step 3: Cross multiply
   21,072.16x = 29,069.71 × 13,514.86
4. Step 4: Simplify right side
   21,072.16x = 392,873,060.89
5. Step 5: Solve for x
   x = 392,873,060.89/21,072.16
6. Step 6: Final answer
   x = 18,644.18