Finding the Fourth Proportional to 99.38, 137.16 and 57.96

Step by Step Solution

1. Step 1: Write the proportion equation
   99.38 : 137.16 = 57.96 : x
2. Step 2: Convert to fraction form
   99.38/137.16 = 57.96/x
3. Step 3: Cross multiply
   99.38x = 137.16 × 57.96
4. Step 4: Simplify right side
   99.38x = 7,949.79
5. Step 5: Solve for x
   x = 7,949.79/99.38
6. Step 6: Final answer
   x = 79.99