Finding the Fourth Proportional to 15,787.82, 21,787.08 and 8,714.25

Step by Step Solution

1. Step 1: Write the proportion equation
   15,787.82 : 21,787.08 = 8,714.25 : x
2. Step 2: Convert to fraction form
   15,787.82/21,787.08 = 8,714.25/x
3. Step 3: Cross multiply
   15,787.82x = 21,787.08 × 8,714.25
4. Step 4: Simplify right side
   15,787.82x = 189,858,061.89
5. Step 5: Solve for x
   x = 189,858,061.89/15,787.82
6. Step 6: Final answer
   x = 12,025.60