Finding the Fourth Proportional to 99.02, 136.69 and 77.15

Step by Step Solution

1. Step 1: Write the proportion equation
   99.02 : 136.69 = 77.15 : x
2. Step 2: Convert to fraction form
   99.02/136.69 = 77.15/x
3. Step 3: Cross multiply
   99.02x = 136.69 × 77.15
4. Step 4: Simplify right side
   99.02x = 10,545.78
5. Step 5: Solve for x
   x = 10,545.78/99.02
6. Step 6: Final answer
   x = 106.50