Finding the Fourth Proportional to 99.12, 136.72 and 75.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99.12 : 136.72 = 75.76 : x
2. Step 2: Convert to fraction form
   99.12/136.72 = 75.76/x
3. Step 3: Cross multiply
   99.12x = 136.72 × 75.76
4. Step 4: Simplify right side
   99.12x = 10,357.91
5. Step 5: Solve for x
   x = 10,357.91/99.12
6. Step 6: Final answer
   x = 104.50