Finding the Fourth Proportional to 12,879.78, 17,773.85 and 7,136.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,879.78 : 17,773.85 = 7,136.69 : x
2. Step 2: Convert to fraction form
   12,879.78/17,773.85 = 7,136.69/x
3. Step 3: Cross multiply
   12,879.78x = 17,773.85 × 7,136.69
4. Step 4: Simplify right side
   12,879.78x = 126,846,333.00
5. Step 5: Solve for x
   x = 126,846,333.00/12,879.78
6. Step 6: Final answer
   x = 9,848.49