Finding the Fourth Proportional to 57.42, 79.31 and 42.93

Step by Step Solution

1. Step 1: Write the proportion equation
   57.42 : 79.31 = 42.93 : x
2. Step 2: Convert to fraction form
   57.42/79.31 = 42.93/x
3. Step 3: Cross multiply
   57.42x = 79.31 × 42.93
4. Step 4: Simplify right side
   57.42x = 3,404.89
5. Step 5: Solve for x
   x = 3,404.89/57.42
6. Step 6: Final answer
   x = 59.30