Finding the Third Proportional to 128.94 and 279.25

Step by Step Solution

1. Step 1: Write the proportion equation
   128.94 : 279.25 = 279.25 : x
2. Step 2: Convert to fraction form
   128.94/279.25 = 279.25/x
3. Step 3: Cross multiply
   128.94x = 279.25 × 279.25
4. Step 4: Simplify right side
   128.94x = 77,980.56
5. Step 5: Solve for x
   x = 77,980.56/128.94
6. Step 6: Final answer
   x = 604.79