Finding the Fourth Proportional to 102.72, 141.72 and 65.93

Step by Step Solution

1. Step 1: Write the proportion equation
   102.72 : 141.72 = 65.93 : x
2. Step 2: Convert to fraction form
   102.72/141.72 = 65.93/x
3. Step 3: Cross multiply
   102.72x = 141.72 × 65.93
4. Step 4: Simplify right side
   102.72x = 9,342.89
5. Step 5: Solve for x
   x = 9,342.89/102.72
6. Step 6: Final answer
   x = 90.95