Finding the Fourth Proportional to 102.86, 141.86 and 67.88

Step by Step Solution

1. Step 1: Write the proportion equation
   102.86 : 141.86 = 67.88 : x
2. Step 2: Convert to fraction form
   102.86/141.86 = 67.88/x
3. Step 3: Cross multiply
   102.86x = 141.86 × 67.88
4. Step 4: Simplify right side
   102.86x = 9,629.46
5. Step 5: Solve for x
   x = 9,629.46/102.86
6. Step 6: Final answer
   x = 93.62