Finding the Fourth Proportional to 102.78, 141.89 and 73.76

Step by Step Solution

1. Step 1: Write the proportion equation
   102.78 : 141.89 = 73.76 : x
2. Step 2: Convert to fraction form
   102.78/141.89 = 73.76/x
3. Step 3: Cross multiply
   102.78x = 141.89 × 73.76
4. Step 4: Simplify right side
   102.78x = 10,464.73
5. Step 5: Solve for x
   x = 10,464.73/102.78
6. Step 6: Final answer
   x = 101.82