Finding the Third Proportional to 128.25 and 192.88

Step by Step Solution

1. Step 1: Write the proportion equation
   128.25 : 192.88 = 192.88 : x
2. Step 2: Convert to fraction form
   128.25/192.88 = 192.88/x
3. Step 3: Cross multiply
   128.25x = 192.88 × 192.88
4. Step 4: Simplify right side
   128.25x = 37,200.77
5. Step 5: Solve for x
   x = 37,200.77/128.25
6. Step 6: Final answer
   x = 290.06