Finding the Fourth Proportional to 99.15, 136.71 and 74.58

Step by Step Solution

1. Step 1: Write the proportion equation
   99.15 : 136.71 = 74.58 : x
2. Step 2: Convert to fraction form
   99.15/136.71 = 74.58/x
3. Step 3: Cross multiply
   99.15x = 136.71 × 74.58
4. Step 4: Simplify right side
   99.15x = 10,195.83
5. Step 5: Solve for x
   x = 10,195.83/99.15
6. Step 6: Final answer
   x = 102.83