Finding the Fourth Proportional to 11,979.27, 17,978.32 and 8,307.34

Step by Step Solution

1. Step 1: Write the proportion equation
   11,979.27 : 17,978.32 = 8,307.34 : x
2. Step 2: Convert to fraction form
   11,979.27/17,978.32 = 8,307.34/x
3. Step 3: Cross multiply
   11,979.27x = 17,978.32 × 8,307.34
4. Step 4: Simplify right side
   11,979.27x = 149,352,016.87
5. Step 5: Solve for x
   x = 149,352,016.87/11,979.27
6. Step 6: Final answer
   x = 12,467.54