Finding the Third Proportional to 7,979.16 and 12,628.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,979.16 : 12,628.78 = 12,628.78 : x
2. Step 2: Convert to fraction form
   7,979.16/12,628.78 = 12,628.78/x
3. Step 3: Cross multiply
   7,979.16x = 12,628.78 × 12,628.78
4. Step 4: Simplify right side
   7,979.16x = 159,486,115.86
5. Step 5: Solve for x
   x = 159,486,115.86/7,979.16
6. Step 6: Final answer
   x = 19,987.84