Finding the Fourth Proportional to 12,455.78, 17,179.25 and 7,979.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,455.78 : 17,179.25 = 7,979.94 : x
2. Step 2: Convert to fraction form
   12,455.78/17,179.25 = 7,979.94/x
3. Step 3: Cross multiply
   12,455.78x = 17,179.25 × 7,979.94
4. Step 4: Simplify right side
   12,455.78x = 137,089,384.25
5. Step 5: Solve for x
   x = 137,089,384.25/12,455.78
6. Step 6: Final answer
   x = 11,006.09