Finding the Fourth Proportional to 103.42, 142.49 and 70.61

Step by Step Solution

1. Step 1: Write the proportion equation
   103.42 : 142.49 = 70.61 : x
2. Step 2: Convert to fraction form
   103.42/142.49 = 70.61/x
3. Step 3: Cross multiply
   103.42x = 142.49 × 70.61
4. Step 4: Simplify right side
   103.42x = 10,061.75
5. Step 5: Solve for x
   x = 10,061.75/103.42
6. Step 6: Final answer
   x = 97.29