Finding the Third Proportional to 79.50 and 100.88

Step by Step Solution

1. Step 1: Write the proportion equation
   79.50 : 100.88 = 100.88 : x
2. Step 2: Convert to fraction form
   79.50/100.88 = 100.88/x
3. Step 3: Cross multiply
   79.50x = 100.88 × 100.88
4. Step 4: Simplify right side
   79.50x = 10,175.77
5. Step 5: Solve for x
   x = 10,175.77/79.50
6. Step 6: Final answer
   x = 128.00