Finding the Fourth Proportional to 103.10, 142.25 and 59.42

Step by Step Solution

1. Step 1: Write the proportion equation
   103.10 : 142.25 = 59.42 : x
2. Step 2: Convert to fraction form
   103.10/142.25 = 59.42/x
3. Step 3: Cross multiply
   103.10x = 142.25 × 59.42
4. Step 4: Simplify right side
   103.10x = 8,452.55
5. Step 5: Solve for x
   x = 8,452.55/103.10
6. Step 6: Final answer
   x = 81.99