Finding the Fourth Proportional to 99.38, 137.12 and 57.94

Step by Step Solution

1. Step 1: Write the proportion equation
   99.38 : 137.12 = 57.94 : x
2. Step 2: Convert to fraction form
   99.38/137.12 = 57.94/x
3. Step 3: Cross multiply
   99.38x = 137.12 × 57.94
4. Step 4: Simplify right side
   99.38x = 7,944.73
5. Step 5: Solve for x
   x = 7,944.73/99.38
6. Step 6: Final answer
   x = 79.94