Finding the Third Proportional to 128.95 and 279.52

Step by Step Solution

1. Step 1: Write the proportion equation
   128.95 : 279.52 = 279.52 : x
2. Step 2: Convert to fraction form
   128.95/279.52 = 279.52/x
3. Step 3: Cross multiply
   128.95x = 279.52 × 279.52
4. Step 4: Simplify right side
   128.95x = 78,128.78
5. Step 5: Solve for x
   x = 78,128.78/128.95
6. Step 6: Final answer
   x = 605.91