Finding the Fourth Proportional to 99.05, 136.69 and 55.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99.05 : 136.69 = 55.38 : x
2. Step 2: Convert to fraction form
   99.05/136.69 = 55.38/x
3. Step 3: Cross multiply
   99.05x = 136.69 × 55.38
4. Step 4: Simplify right side
   99.05x = 7,569.89
5. Step 5: Solve for x
   x = 7,569.89/99.05
6. Step 6: Final answer
   x = 76.42