Finding the Fourth Proportional to 12,980.16, 17,919.36 and 7,951.68

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.16 : 17,919.36 = 7,951.68 : x
2. Step 2: Convert to fraction form
   12,980.16/17,919.36 = 7,951.68/x
3. Step 3: Cross multiply
   12,980.16x = 17,919.36 × 7,951.68
4. Step 4: Simplify right side
   12,980.16x = 142,489,016.52
5. Step 5: Solve for x
   x = 142,489,016.52/12,980.16
6. Step 6: Final answer
   x = 10,977.45