Finding the Fourth Proportional to 12,747.88, 17,595.80 and 8,505.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,747.88 : 17,595.80 = 8,505.12 : x
2. Step 2: Convert to fraction form
   12,747.88/17,595.80 = 8,505.12/x
3. Step 3: Cross multiply
   12,747.88x = 17,595.80 × 8,505.12
4. Step 4: Simplify right side
   12,747.88x = 149,654,390.50
5. Step 5: Solve for x
   x = 149,654,390.50/12,747.88
6. Step 6: Final answer
   x = 11,739.55