Finding the Fourth Proportional to 99.25, 136.96 and 57.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99.25 : 136.96 = 57.83 : x
2. Step 2: Convert to fraction form
   99.25/136.96 = 57.83/x
3. Step 3: Cross multiply
   99.25x = 136.96 × 57.83
4. Step 4: Simplify right side
   99.25x = 7,920.72
5. Step 5: Solve for x
   x = 7,920.72/99.25
6. Step 6: Final answer
   x = 79.81