Finding the Fourth Proportional to 102.50, 141.42 and 89.54

Step by Step Solution

1. Step 1: Write the proportion equation
   102.50 : 141.42 = 89.54 : x
2. Step 2: Convert to fraction form
   102.50/141.42 = 89.54/x
3. Step 3: Cross multiply
   102.50x = 141.42 × 89.54
4. Step 4: Simplify right side
   102.50x = 12,662.75
5. Step 5: Solve for x
   x = 12,662.75/102.50
6. Step 6: Final answer
   x = 123.54