Finding the Fourth Proportional to 12,798.72, 17,658.72 and 8,081.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,798.72 : 17,658.72 = 8,081.28 : x
2. Step 2: Convert to fraction form
   12,798.72/17,658.72 = 8,081.28/x
3. Step 3: Cross multiply
   12,798.72x = 17,658.72 × 8,081.28
4. Step 4: Simplify right side
   12,798.72x = 142,705,060.76
5. Step 5: Solve for x
   x = 142,705,060.76/12,798.72
6. Step 6: Final answer
   x = 11,149.95