Finding the Fourth Proportional to 103.42, 142.86 and 83.98

Step by Step Solution

1. Step 1: Write the proportion equation
   103.42 : 142.86 = 83.98 : x
2. Step 2: Convert to fraction form
   103.42/142.86 = 83.98/x
3. Step 3: Cross multiply
   103.42x = 142.86 × 83.98
4. Step 4: Simplify right side
   103.42x = 11,997.38
5. Step 5: Solve for x
   x = 11,997.38/103.42
6. Step 6: Final answer
   x = 116.01