Finding the Fourth Proportional to 15,768.34, 21,760.28 and 8,694.78

Step by Step Solution

1. Step 1: Write the proportion equation
   15,768.34 : 21,760.28 = 8,694.78 : x
2. Step 2: Convert to fraction form
   15,768.34/21,760.28 = 8,694.78/x
3. Step 3: Cross multiply
   15,768.34x = 21,760.28 × 8,694.78
4. Step 4: Simplify right side
   15,768.34x = 189,200,847.34
5. Step 5: Solve for x
   x = 189,200,847.34/15,768.34
6. Step 6: Final answer
   x = 11,998.78