Finding the Fourth Proportional to 102.88, 141.78 and 73.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102.88 : 141.78 = 73.72 : x
2. Step 2: Convert to fraction form
   102.88/141.78 = 73.72/x
3. Step 3: Cross multiply
   102.88x = 141.78 × 73.72
4. Step 4: Simplify right side
   102.88x = 10,452.02
5. Step 5: Solve for x
   x = 10,452.02/102.88
6. Step 6: Final answer
   x = 101.59