Finding the Fourth Proportional to 21,859.56, 32,787.72 and 8,714.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,859.56 : 32,787.72 = 8,714.88 : x
2. Step 2: Convert to fraction form
   21,859.56/32,787.72 = 8,714.88/x
3. Step 3: Cross multiply
   21,859.56x = 32,787.72 × 8,714.88
4. Step 4: Simplify right side
   21,859.56x = 285,741,045.27
5. Step 5: Solve for x
   x = 285,741,045.27/21,859.56
6. Step 6: Final answer
   x = 13,071.67