Finding the Fourth Proportional to 12,979.25, 17,911.39 and 7,390.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,979.25 : 17,911.39 = 7,390.25 : x
2. Step 2: Convert to fraction form
   12,979.25/17,911.39 = 7,390.25/x
3. Step 3: Cross multiply
   12,979.25x = 17,911.39 × 7,390.25
4. Step 4: Simplify right side
   12,979.25x = 132,369,649.95
5. Step 5: Solve for x
   x = 132,369,649.95/12,979.25
6. Step 6: Final answer
   x = 10,198.56