Finding the Fourth Proportional to 15,768.18, 21,760.79 and 9,054.09

Step by Step Solution

1. Step 1: Write the proportion equation
   15,768.18 : 21,760.79 = 9,054.09 : x
2. Step 2: Convert to fraction form
   15,768.18/21,760.79 = 9,054.09/x
3. Step 3: Cross multiply
   15,768.18x = 21,760.79 × 9,054.09
4. Step 4: Simplify right side
   15,768.18x = 197,024,105.86
5. Step 5: Solve for x
   x = 197,024,105.86/15,768.18
6. Step 6: Final answer
   x = 12,495.04