Finding the Fourth Proportional to 99.38, 137.12 and 57.37

Step by Step Solution

1. Step 1: Write the proportion equation
   99.38 : 137.12 = 57.37 : x
2. Step 2: Convert to fraction form
   99.38/137.12 = 57.37/x
3. Step 3: Cross multiply
   99.38x = 137.12 × 57.37
4. Step 4: Simplify right side
   99.38x = 7,865.94
5. Step 5: Solve for x
   x = 7,865.94/99.38
6. Step 6: Final answer
   x = 79.15